diff --git a/docker/pyproject.deps.toml b/docker/pyproject.deps.toml
index aee68f8..fb38977 100644
--- a/docker/pyproject.deps.toml
+++ b/docker/pyproject.deps.toml
@@ -1,6 +1,6 @@
 [project]
 name = "mcp-plex"
-version = "1.0.8"
+version = "1.0.9"
 requires-python = ">=3.11,<3.13"
 dependencies = [
   "fastmcp>=2.11.2",
diff --git a/mcp_plex/server/__init__.py b/mcp_plex/server/__init__.py
index b4abf33..65e635a 100644
--- a/mcp_plex/server/__init__.py
+++ b/mcp_plex/server/__init__.py
@@ -225,13 +225,47 @@ async def _get_media_data(identifier: str) -> dict[str, Any]:
         raise ValueError("Media item not found")
     payload = _flatten_payload(records[0].payload)
     data = payload
-    rating_key = str(data.get("plex", {}).get("rating_key"))
+
+    def _normalize_identifier(value: Any) -> str | None:
+        if value is None:
+            return None
+        if isinstance(value, str):
+            normalized = value.strip()
+            return normalized or None
+        try:
+            return str(value)
+        except Exception:
+            return None
+
+    cache_keys: set[str] = set()
+
+    lookup_key = _normalize_identifier(identifier)
+    if lookup_key:
+        cache_keys.add(lookup_key)
+
+    plex_data = data.get("plex", {}) or {}
+    rating_key = _normalize_identifier(plex_data.get("rating_key"))
+    if rating_key:
+        cache_keys.add(rating_key)
+    guid = _normalize_identifier(plex_data.get("guid"))
+    if guid:
+        cache_keys.add(guid)
+
+    for source_key in ("imdb", "tmdb", "tvdb"):
+        source_data = data.get(source_key)
+        if isinstance(source_data, dict):
+            source_id = _normalize_identifier(source_data.get("id"))
+            if source_id:
+                cache_keys.add(source_id)
+
+    for cache_key in cache_keys:
+        server.cache.set_payload(cache_key, payload)
+
     if rating_key:
-        server.cache.set_payload(rating_key, payload)
-        thumb = data.get("plex", {}).get("thumb")
+        thumb = plex_data.get("thumb")
         if thumb:
             server.cache.set_poster(rating_key, thumb)
-        art = data.get("plex", {}).get("art")
+        art = plex_data.get("art")
         if art:
             server.cache.set_background(rating_key, art)
     return payload
diff --git a/pyproject.toml b/pyproject.toml
index c539dd5..6f45a1d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "mcp-plex"
-version = "1.0.8"
+version = "1.0.9"
 
 description = "Plex-Oriented Model Context Protocol Server"
 requires-python = ">=3.11,<3.13"
diff --git a/tests/test_server.py b/tests/test_server.py
index 0b2d230..bfdc323 100644
--- a/tests/test_server.py
+++ b/tests/test_server.py
@@ -154,6 +154,35 @@ def test_server_tools(monkeypatch):
             asyncio.run(server.media_background.fn(identifier="0"))
 
 
+def test_get_media_data_caches_external_ids(monkeypatch):
+    with _load_server(monkeypatch) as server:
+        call_count = 0
+
+        original_find_records = server._find_records
+
+        async def _counting_find_records(identifier: str, limit: int = 1):
+            nonlocal call_count
+            call_count += 1
+            return await original_find_records(identifier, limit=limit)
+
+        monkeypatch.setattr(server, "_find_records", _counting_find_records)
+
+        imdb_id = "tt8367814"
+        tmdb_id = "522627"
+
+        data = asyncio.run(server._get_media_data(imdb_id))
+        assert data["plex"]["rating_key"] == "49915"
+        assert call_count == 1
+
+        cached_imdb = asyncio.run(server._get_media_data(imdb_id))
+        assert cached_imdb["plex"]["rating_key"] == "49915"
+        assert call_count == 1
+
+        cached_tmdb = asyncio.run(server._get_media_data(tmdb_id))
+        assert cached_tmdb["plex"]["rating_key"] == "49915"
+        assert call_count == 1
+
+
 def test_new_media_tools(monkeypatch):
     with _load_server(monkeypatch) as server:
         movies = asyncio.run(server.new_movies.fn(limit=1))
diff --git a/uv.lock b/uv.lock
index 5151b52..70dce72 100644
--- a/uv.lock
+++ b/uv.lock
@@ -730,7 +730,7 @@ wheels = [
 
 [[package]]
 name = "mcp-plex"
-version = "1.0.8"
+version = "1.0.9"
 source = { editable = "." }
 dependencies = [
     { name = "fastapi" },