diff --git a/libs/portal/xtream/feature/src/lib/serial-details/serial-details-playback.service.spec.ts b/libs/portal/xtream/feature/src/lib/serial-details/serial-details-playback.service.spec.ts
new file mode 100644
index 000000000..42fd27837
--- /dev/null
+++ b/libs/portal/xtream/feature/src/lib/serial-details/serial-details-playback.service.spec.ts
@@ -0,0 +1,80 @@
+import { signal } from '@angular/core';
+import { TestBed } from '@angular/core/testing';
+import { ActivatedRoute } from '@angular/router';
+import { PlaybackHistoryGate } from '@iptvnator/playback/data-access';
+import {
+    PORTAL_EXTERNAL_PLAYBACK,
+    PORTAL_PLAYBACK_POSITIONS,
+    PORTAL_PLAYER,
+} from '@iptvnator/portal/shared/util';
+import { XtreamStore } from '@iptvnator/portal/xtream/data-access';
+import { PlaybackPositionRuntimeBridgeService } from '@iptvnator/services';
+import {
+    SerialDetailsPlaybackService,
+    type XtreamSerieDetailsView,
+} from './serial-details-playback.service';
+import { XTREAM_SERIES_RESUME_TARGET } from './serial-details-resume-target.token';
+import { SerialDetailsSeasonWatchService } from './serial-details-season-watch.service';
+
+const series = {
+    series_id: 103,
+    info: {},
+    episodes: {},
+} as unknown as XtreamSerieDetailsView;
+
+/** A fresh page: the component provides the service, so each visit gets its own instance. */
+function createPage(): SerialDetailsPlaybackService {
+    TestBed.resetTestingModule();
+    TestBed.configureTestingModule({
+        providers: [
+            SerialDetailsPlaybackService,
+            { provide: ActivatedRoute, useValue: {} },
+            {
+                provide: XtreamStore,
+                useValue: { currentPlaylist: signal({ id: 'xtream-1' }) },
+            },
+            { provide: PORTAL_PLAYBACK_POSITIONS, useValue: {} },
+            { provide: PORTAL_PLAYER, useValue: {} },
+            {
+                provide: PORTAL_EXTERNAL_PLAYBACK,
+                useValue: { activeSession: signal(null) },
+            },
+            {
+                provide: PlaybackPositionRuntimeBridgeService,
+                useValue: { onPlaybackPositionUpdate: () => undefined },
+            },
+            { provide: PlaybackHistoryGate, useValue: {} },
+            { provide: XTREAM_SERIES_RESUME_TARGET, useValue: signal(null) },
+            {
+                provide: SerialDetailsSeasonWatchService,
+                useValue: { batchRunning: signal(false) },
+            },
+        ],
+    });
+    const service = TestBed.inject(SerialDetailsPlaybackService);
+    service.bind({ selectedItem: signal(series) });
+    return service;
+}
+
+describe('SerialDetailsPlaybackService page token', () => {
+    it('gives a recreated page of the same series a token of its own', () => {
+        const first = createPage();
+        const firstOwner = first.launchOwner();
+        const firstToken = first.pageToken();
+
+        const reopened = createPage();
+
+        expect(reopened.launchOwner()).toBe(firstOwner);
+        expect(reopened.pageToken()).not.toBe(firstToken);
+    });
+
+    it('changes the token when the page moves on to another series', () => {
+        const page = createPage();
+        const token = page.pageToken();
+
+        page.resetForNewSeries();
+
+        expect(page.launchOwner()).toBe('xtream-1:103');
+        expect(page.pageToken()).not.toBe(token);
+    });
+});
diff --git a/libs/portal/xtream/feature/src/lib/serial-details/serial-details-playback.service.ts b/libs/portal/xtream/feature/src/lib/serial-details/serial-details-playback.service.ts
index 35f783c64..eb1fb206e 100644
--- a/libs/portal/xtream/feature/src/lib/serial-details/serial-details-playback.service.ts
+++ b/libs/portal/xtream/feature/src/lib/serial-details/serial-details-playback.service.ts
@@ -61,14 +61,14 @@ interface SerialDetailsPlaybackBindings {
     readonly selectedItem: Signal<XtreamSerieDetailsView | null>;
 }
 
+/** Page instances created so far: a recreated page must not reuse a token. */
+let pageInstances = 0;
+
 /**
  * Component-provided service that owns the episode playback concern of the
  * serial details view: inline playback state, per-episode playback
  * positions, external-player session tracking, and playback orchestration.
  */
-/** Page instances created so far: a recreated page must not reuse a token. */
-let pageInstances = 0;
-
 @Injectable()
 export class SerialDetailsPlaybackService {
     private readonly route = inject(ActivatedRoute);