diff --git a/packages/adapters/src/tmdb/episode-groups.test.ts b/packages/adapters/src/tmdb/episode-groups.test.ts
new file mode 100644
index 00000000..9b501f79
--- /dev/null
+++ b/packages/adapters/src/tmdb/episode-groups.test.ts
@@ -0,0 +1,115 @@
+import { createMockTmdb, type MockTmdb, SPLIT_COUR_FIXTURE, TMDB_FIXTURES } from "@umt/testkit";
+import { afterEach, describe, expect, it } from "vitest";
+import { createTmdbClient, fetchEpisodeGroup, fetchEpisodeGroups, groupSeasonAsRichSeason } from "./index.ts";
+
+let mock: MockTmdb | null = null;
+afterEach(async () => {
+  await mock?.close();
+  mock = null;
+});
+
+async function setup() {
+  mock = await createMockTmdb({ fixtures: [...TMDB_FIXTURES, SPLIT_COUR_FIXTURE] });
+  const tmdb = createTmdbClient({ baseUrl: `${mock.url}/3`, apiKey: "test-tmdb-key", retries: 0, timeoutMs: 1000 });
+  return { mock, tmdb };
+}
+
+describe("TMDB 剧集组", () => {
+  it("列表:id、名称、类型、组数、集数、播出平台", async () => {
+    const { tmdb } = await setup();
+    const groups = await fetchEpisodeGroups(tmdb, 990001, "zh-CN");
+    expect(groups).toEqual([
+      {
+        id: "grp-production",
+        name: "制作季",
+        type: 6,
+        description: null,
+        groupCount: 2,
+        episodeCount: 25,
+        network: "TOKYO MX",
+      },
+      {
+        id: "grp-aired",
+        name: "播出顺序",
+        type: 1,
+        description: null,
+        groupCount: 1,
+        episodeCount: 25,
+        network: null,
+      },
+    ]);
+  });
+
+  it("详情:组序号 = 季号,组内顺序从 1 编集号,保留 TMDB 默认季集号、标题、播出日期", async () => {
+    const { tmdb } = await setup();
+    const g = await fetchEpisodeGroup(tmdb, "grp-production", "zh-CN");
+    expect(g.name).toBe("制作季");
+    expect(g.seasons.map((s) => [s.seasonNumber, s.name, s.episodes.length, s.airDate])).toEqual([
+      [1, "第一部", 12, "2024-01-07"],
+      [2, "第二部", 13, "2024-07-07"],
+    ]);
+    const s2e1 = g.seasons[1]!.episodes[0]!;
+    expect(s2e1).toMatchObject({
+      seasonNumber: 2,
+      episodeNumber: 1,
+      tmdbSeason: 1,
+      tmdbEpisode: 13,
+      name: "下篇第1话",
+      nameLanguage: "zh-CN",
+      airDate: "2024-07-07",
+    });
+    expect(g.seasons[1]!.episodes.at(-1)).toMatchObject({ episodeNumber: 13, tmdbEpisode: 25 });
+  });
+
+  it("组内按 order 排序;重复的组序号顺延;占位名按无标题处理", async () => {
+    const calls: string[] = [];
+    const client = {
+      getJson: async <T>(path: string) => {
+        calls.push(path);
+        return {
+          id: "x",
+          name: "X",
+          type: 3,
+          groups: [
+            {
+              id: "b",
+              name: "B",
+              order: 1,
+              episodes: [{ order: 0, season_number: 2, episode_number: 1, name: "Opening", air_date: "2020-01-01" }],
+            },
+            {
+              id: "a",
+              name: "A",
+              order: 1,
+              episodes: [
+                { order: 1, season_number: 1, episode_number: 5, name: "第 5 集", air_date: "2019-02-01" },
+                { order: 0, season_number: 1, episode_number: 9, name: "Nine", air_date: "2019-01-01" },
+              ],
+            },
+          ],
+        } as T;
+      },
+    };
+    const g = await fetchEpisodeGroup(client, "x", "zh-CN");
+    expect(calls).toEqual(["/tv/episode_group/x"]);
+    expect(g.seasons.map((s) => [s.seasonNumber, s.name])).toEqual([
+      [1, "B"],
+      [2, "A"],
+    ]);
+    expect(g.seasons[1]!.episodes.map((e) => [e.episodeNumber, e.tmdbSeason, e.tmdbEpisode, e.name])).toEqual([
+      [1, 1, 9, "Nine"],
+      [2, 1, 5, null],
+    ]);
+    const rich = groupSeasonAsRichSeason(42, g.seasons[1]!, "zh-CN", "/p.jpg");
+    expect(rich).toMatchObject({ tvId: "42", seasonNumber: 2, name: "A", posterPath: "/p.jpg", airDate: "2019-01-01" });
+  });
+
+  it("剧集组不存在抛 notfound;请求走缓存", async () => {
+    const { tmdb, mock } = await setup();
+    await expect(fetchEpisodeGroup(tmdb, "nope")).rejects.toMatchObject({ kind: "notfound" });
+    await fetchEpisodeGroups(tmdb, 990001, "zh-CN");
+    const before = mock.calls.length;
+    await fetchEpisodeGroups(tmdb, 990001, "zh-CN");
+    expect(mock.calls.length).toBe(before);
+  });
+});
diff --git a/packages/adapters/src/tmdb/episode-groups.ts b/packages/adapters/src/tmdb/episode-groups.ts
new file mode 100644
index 00000000..4438ad70
--- /dev/null
+++ b/packages/adapters/src/tmdb/episode-groups.ts
@@ -0,0 +1,178 @@
+/**
+ * TMDB 剧集组(episode groups):一部剧在默认季之外由编辑整理的其它季集结构(按播出、DVD、制作季、故事线…)。
+ * 迁移来源:MoviePilot app/modules/themoviedb/tmdbv3api/objs/tv.py episode_groups(`/tv/{id}/episode_groups`)、
+ *   objs/group.py details(`/tv/episode_group/{id}`)、tmdbapi.py get_tv_group_seasons(组内集号按顺序从 1 重排)、
+ *   get_tv_group_detail(按 order 取组 = 季);请求缓存同 client.ts(MP tmdbv3api request 的 @cached)。
+ * 调整:组内集按 TMDB 给的 order 排序后再编号(MP 直接用返回顺序,两者在 TMDB 实际数据上一致);
+ *   每集保留 TMDB 默认季集号(tmdbSeason / tmdbEpisode),供切换季集结构时对照迁移;
+ *   占位名("第 14 集"这类按默认集号起的名字)在组里位置不同,按无标题处理。
+ */
+import type { TmdbClient } from "./client.ts";
+import type { TmdbRichEpisode, TmdbRichSeasonDetail } from "./details.ts";
+import { isPlaceholderEpisodeName } from "./translations.ts";
+
+type Json = Record<string, unknown>;
+const s = (v: unknown): string | null => (typeof v === "string" && v.trim() !== "" ? v.trim() : null);
+const n = (v: unknown): number | null => (typeof v === "number" && Number.isFinite(v) ? v : null);
+const int = (v: unknown): number | null => {
+  const x = n(v);
+  return x === null ? null : Math.round(x);
+};
+const DATE_RE = /^\d{4}-\d{2}-\d{2}/;
+
+/** TMDB 剧集组类型(type 1–7) */
+export const EPISODE_GROUP_TYPES: Readonly<Record<number, string>> = {
+  1: "原始播出",
+  2: "绝对集号",
+  3: "DVD",
+  4: "数字发行",
+  5: "故事线",
+  6: "制作季",
+  7: "电视",
+};
+
+export interface TmdbEpisodeGroupSummary {
+  id: string;
+  name: string;
+  /** TMDB type 1–7(见 EPISODE_GROUP_TYPES);未知为 null */
+  type: number | null;
+  description: string | null;
+  /** 组(= 季)数 */
+  groupCount: number;
+  episodeCount: number;
+  network: string | null;
+}
+
+export interface TmdbEpisodeGroupEpisode extends TmdbRichEpisode {
+  /** TMDB 默认季集号(切换季集结构时据此对照) */
+  tmdbSeason: number;
+  tmdbEpisode: number;
+}
+
+export interface TmdbEpisodeGroupSeason {
+  /** 组的 TMDB id */
+  id: string | null;
+  /** 季号 = 组的 order(MP 同口径) */
+  seasonNumber: number;
+  name: string | null;
+  /** 首集播出日期 */
+  airDate: string | null;
+  episodes: TmdbEpisodeGroupEpisode[];
+}
+
+export interface TmdbEpisodeGroupDetail {
+  id: string;
+  name: string;
+  type: number | null;
+  description: string | null;
+  network: string | null;
+  seasons: TmdbEpisodeGroupSeason[];
+  language: string;
+}
+
+/** `/tv/{id}/episode_groups`:剧集组列表(TMDB 顺序) */
+export async function fetchEpisodeGroups(
+  client: Pick<TmdbClient, "getJson">,
+  tvId: string | number,
+  language?: string,
+): Promise<TmdbEpisodeGroupSummary[]> {
+  const j = await client.getJson<Json>(`/tv/${tvId}/episode_groups`, { language });
+  return ((Array.isArray(j.results) ? j.results : []) as Json[])
+    .filter((g) => s(g.id))
+    .map((g) => ({
+      id: s(g.id)!,
+      name: s(g.name) ?? s(g.id)!,
+      type: int(g.type),
+      description: s(g.description),
+      groupCount: int(g.group_count) ?? 0,
+      episodeCount: int(g.episode_count) ?? 0,
+      network: s((g.network as Json | null | undefined)?.name),
+    }));
+}
+
+function groupEpisode(e: Json, season: number, episode: number, lang: string): TmdbEpisodeGroupEpisode {
+  const rawName = s(e.name);
+  const name = rawName && !isPlaceholderEpisodeName(rawName) ? rawName : null;
+  const overview = s(e.overview);
+  const air = s(e.air_date);
+  return {
+    seasonNumber: season,
+    episodeNumber: episode,
+    name,
+    nameLanguage: name ? lang : null,
+    overview,
+    overviewLanguage: overview ? lang : null,
+    airDate: air && DATE_RE.test(air) ? air.slice(0, 10) : null,
+    runtime: int(e.runtime),
+    stillPath: s(e.still_path),
+    voteAverage:
+      n(e.vote_average) !== null && (int(e.vote_count) ?? 0) > 0 ? Math.round(n(e.vote_average)! * 10) / 10 : null,
+    voteCount: int(e.vote_count),
+    tmdbSeason: int(e.season_number) ?? 0,
+    tmdbEpisode: int(e.episode_number) ?? 0,
+  };
+}
+
+/**
+ * `/tv/episode_group/{id}`:组 = 季(季号取 order),组内按 order 排序后从 1 编集号。
+ * 同一 order 出现两次时后面的组顺延到下一个空季号(TMDB 编辑数据偶有重复)。
+ */
+export async function fetchEpisodeGroup(
+  client: Pick<TmdbClient, "getJson">,
+  groupId: string,
+  language?: string,
+): Promise<TmdbEpisodeGroupDetail> {
+  const lang = language ?? "zh-CN";
+  const j = await client.getJson<Json>(`/tv/episode_group/${encodeURIComponent(groupId)}`, { language: lang });
+  const groups = ((Array.isArray(j.groups) ? j.groups : []) as Json[])
+    .map((g, i) => ({ g, order: int(g.order) ?? i }))
+    .sort((a, b) => a.order - b.order);
+  const used = new Set<number>();
+  const seasons: TmdbEpisodeGroupSeason[] = [];
+  for (const { g, order } of groups) {
+    let season = Math.max(0, order);
+    while (used.has(season)) season++;
+    used.add(season);
+    const eps = ((Array.isArray(g.episodes) ? g.episodes : []) as Json[])
+      .map((e, i) => ({ e, order: int(e.order) ?? i }))
+      .sort((a, b) => a.order - b.order)
+      .map(({ e }, i) => groupEpisode(e, season, i + 1, lang));
+    seasons.push({
+      id: s(g.id),
+      seasonNumber: season,
+      name: s(g.name),
+      airDate: eps.find((e) => e.airDate)?.airDate ?? null,
+      episodes: eps,
+    });
+  }
+  return {
+    id: s(j.id) ?? groupId,
+    name: s(j.name) ?? groupId,
+    type: int(j.type),
+    description: s(j.description),
+    network: s((j.network as Json | null | undefined)?.name),
+    seasons,
+    language: lang,
+  };
+}
+
+/** 剧集组的一季 → 季详情结构(元数据刷新写季 / 集单元时与默认季同一条路径);海报由调用方补 */
+export function groupSeasonAsRichSeason(
+  tvId: string | number,
+  season: TmdbEpisodeGroupSeason,
+  language: string,
+  posterPath: string | null = null,
+): TmdbRichSeasonDetail & { episodes: TmdbEpisodeGroupEpisode[] } {
+  return {
+    tvId: String(tvId),
+    seasonNumber: season.seasonNumber,
+    name: season.name,
+    nameLanguage: season.name ? language : null,
+    overview: null,
+    overviewLanguage: null,
+    airDate: season.airDate,
+    posterPath,
+    episodes: season.episodes,
+    fetchedLanguages: [language],
+  };
+}
diff --git a/packages/adapters/src/tmdb/index.ts b/packages/adapters/src/tmdb/index.ts
index 9cd5e2c2..4676f6bd 100644
--- a/packages/adapters/src/tmdb/index.ts
+++ b/packages/adapters/src/tmdb/index.ts
@@ -1,6 +1,7 @@
 export { RequestLimiter, TtlLruCache } from "./cache.ts";
 export * from "./client.ts";
 export * from "./details.ts";
+export * from "./episode-groups.ts";
 export * from "./match.ts";
 export * from "./recall.ts";
 export * from "./translations.ts";
diff --git a/packages/testkit/src/tmdb/fixtures.ts b/packages/testkit/src/tmdb/fixtures.ts
index 76f21bc0..af0454c8 100644
--- a/packages/testkit/src/tmdb/fixtures.ts
+++ b/packages/testkit/src/tmdb/fixtures.ts
@@ -56,6 +56,17 @@ export interface TmdbFixture {
   seasons?: TmdbFixtureSeason[];
   /** 海报路径(拼 image.tmdb.org);缺省 null */
   poster_path?: string | null;
+  /** 剧集组(`/tv/{id}/episode_groups`、`/tv/episode_group/{id}`);组内集按 TMDB 默认季集号引用 seasons 里的集 */
+  episode_groups?: TmdbFixtureEpisodeGroup[];
+}
+
+export interface TmdbFixtureEpisodeGroup {
+  id: string;
+  name: string;
+  type: number;
+  description?: string;
+  network?: string | null;
+  groups: { id?: string; name: string; order: number; episodes: { season_number: number; episode_number: number }[] }[];
 }
 
 function eps(n: number, start: string, zh: (i: number) => string, en: (i: number) => string): TmdbFixtureEpisode[] {
@@ -374,3 +385,90 @@ export const HEART_SIGNAL_FIXTURE: TmdbFixture = {
     },
   ],
 };
+
+/**
+ * 两个 cour 被 TMDB 默认季合成一季的番剧(剧集组测试用):默认 S1 共 25 集(含季 0 特别篇 1 集);
+ * 剧集组「制作季」把它拆成 S1(1–12)、S2(13–25),不含特别篇;剧集组「播出顺序」把全部 25 集放在一季。
+ * 不在 TMDB_FIXTURES 里,用到的测试自行拼进 fixtures。
+ */
+export const SPLIT_COUR_FIXTURE: TmdbFixture = {
+  type: "tv",
+  id: 990001,
+  original_title: "Split Cour",
+  original_language: "ja",
+  origin_country: ["JP"],
+  date: "2024-01-07",
+  titles: { "zh-CN": "分割番", "en-US": "Split Cour" },
+  overviews: { "zh-CN": "两个 cour 的番剧。" },
+  popularity: 30,
+  alternative_titles: [],
+  external_ids: { imdb_id: null, tvdb_id: null },
+  rich: { genres: ["动画"], status: "Ended" },
+  poster_path: "/split.jpg",
+  seasons: [
+    {
+      season_number: 0,
+      air_date: "2024-12-25",
+      names: { "zh-CN": "特别篇", "en-US": "Specials" },
+      episodes: [{ episode_number: 1, air_date: "2024-12-25", names: { "zh-CN": "圣诞特别篇", "en-US": "Xmas" } }],
+    },
+    {
+      season_number: 1,
+      air_date: "2024-01-07",
+      names: { "zh-CN": "第 1 季", "en-US": "Season 1" },
+      poster_path: "/split-s1.jpg",
+      episodes: [
+        ...eps(
+          12,
+          "2024-01-07",
+          (i) => `上篇第${i}话`,
+          (i) => `Part1 Ep${i}`,
+        ),
+        ...eps(
+          13,
+          "2024-07-07",
+          (i) => `下篇第${i}话`,
+          (i) => `Part2 Ep${i}`,
+        ).map((e, k) => ({
+          ...e,
+          episode_number: 13 + k,
+        })),
+      ],
+    },
+  ],
+  episode_groups: [
+    {
+      id: "grp-production",
+      name: "制作季",
+      type: 6,
+      network: "TOKYO MX",
+      groups: [
+        {
+          id: "g1",
+          name: "第一部",
+          order: 1,
+          episodes: Array.from({ length: 12 }, (_, k) => ({ season_number: 1, episode_number: k + 1 })),
+        },
+        {
+          id: "g2",
+          name: "第二部",
+          order: 2,
+          episodes: Array.from({ length: 13 }, (_, k) => ({ season_number: 1, episode_number: 13 + k })),
+        },
+      ],
+    },
+    {
+      id: "grp-aired",
+      name: "播出顺序",
+      type: 1,
+      groups: [
+        {
+          id: "a1",
+          name: "全集",
+          order: 1,
+          episodes: Array.from({ length: 25 }, (_, k) => ({ season_number: 1, episode_number: k + 1 })),
+        },
+      ],
+    },
+  ],
+};
diff --git a/packages/testkit/src/tmdb/mock-tmdb.ts b/packages/testkit/src/tmdb/mock-tmdb.ts
index 83aebc59..8ad5272c 100644
--- a/packages/testkit/src/tmdb/mock-tmdb.ts
+++ b/packages/testkit/src/tmdb/mock-tmdb.ts
@@ -19,7 +19,7 @@ const notFound: MockReply = {
   json: { success: false, status_code: 34, status_message: "The resource you requested could not be found." },
 };
 
-/** mock TMDB v3:/3/search/{movie,tv}、/3/find/:imdbId、/3/{movie,tv}/:id(append_to_response)、/3/tv/:id/season/:n */
+/** mock TMDB v3:/3/search/{movie,tv}、/3/find/:imdbId、/3/{movie,tv}/:id(append_to_response)、/3/tv/:id/season/:n、/3/tv/:id/episode_groups、/3/tv/episode_group/:id */
 export async function createMockTmdb(opts: MockTmdbOptions = {}): Promise<MockTmdb> {
   const fx = opts.fixtures ?? TMDB_FIXTURES;
   const apiKey = opts.apiKey ?? "test-tmdb-key";
@@ -101,6 +101,72 @@ export async function createMockTmdb(opts: MockTmdbOptions = {}): Promise<MockTm
           };
         },
       ],
+      [
+        /^\/3\/tv\/(\d+)\/episode_groups$/,
+        (m) => {
+          const f = find("tv", m[1]!);
+          if (!f) return notFound;
+          return {
+            json: {
+              id: f.id,
+              results: (f.episode_groups ?? []).map((g) => ({
+                id: g.id,
+                name: g.name,
+                type: g.type,
+                description: g.description ?? "",
+                group_count: g.groups.length,
+                episode_count: g.groups.reduce((a, x) => a + x.episodes.length, 0),
+                network: g.network ? { id: 1, name: g.network } : null,
+              })),
+            },
+          };
+        },
+      ],
+      [
+        /^\/3\/tv\/episode_group\/([\w-]+)$/,
+        (m, q) => {
+          const owner = fx.find((f) => f.episode_groups?.some((g) => g.id === m[1]));
+          const g = owner?.episode_groups?.find((x) => x.id === m[1]);
+          if (!owner || !g) return notFound;
+          const lang = q.language ?? "en-US";
+          const zh = lang.startsWith("zh");
+          return {
+            json: {
+              id: g.id,
+              name: g.name,
+              type: g.type,
+              description: g.description ?? "",
+              group_count: g.groups.length,
+              episode_count: g.groups.reduce((a, x) => a + x.episodes.length, 0),
+              network: g.network ? { id: 1, name: g.network } : null,
+              groups: g.groups.map((x, gi) => ({
+                id: x.id ?? `${g.id}-${gi}`,
+                name: x.name,
+                order: x.order,
+                locked: true,
+                episodes: x.episodes.map((ref, order) => {
+                  const s = owner.seasons?.find((y) => y.season_number === ref.season_number);
+                  const e = s?.episodes.find((y) => y.episode_number === ref.episode_number);
+                  return {
+                    id: owner.id * 10000 + ref.season_number * 1000 + ref.episode_number,
+                    show_id: owner.id,
+                    order,
+                    season_number: ref.season_number,
+                    episode_number: ref.episode_number,
+                    name: e?.names[lang] ?? (zh ? `第 ${ref.episode_number} 集` : `Episode ${ref.episode_number}`),
+                    overview: e?.overviews?.[lang] ?? "",
+                    air_date: e?.air_date ?? null,
+                    runtime: e?.runtime ?? null,
+                    still_path: e?.still_path ?? null,
+                    vote_average: e?.vote_average ?? 0,
+                    vote_count: e?.vote_count ?? 0,
+                  };
+                }),
+              })),
+            },
+          };
+        },
+      ],
       [
         /^\/3\/tv\/(\d+)\/season\/(\d+)$/,
         (m, q) => {