diff --git a/scripts/media-shows.py b/scripts/media-shows.py
index 44d52bb..ccee97c 100755
--- a/scripts/media-shows.py
+++ b/scripts/media-shows.py
@@ -112,6 +112,9 @@ VIDEO_EXT = {".mkv", ".mp4", ".avi", ".m4v", ".mov", ".ts", ".m2ts", ".mpg",
 SUB_EXT = {".srt", ".ass", ".ssa", ".sub", ".vtt"}
 IMG_EXT = {".jpg", ".jpeg", ".png", ".webp", ".bmp", ".gif", ".tbn"}
 NFO_EXT = {".nfo", ".xml"}
+# The container's own word, for a sidecar named "episode.mkv.srt": that component
+# is not a language flag, and both matchers read the plain form better.
+CONTAINER = {e[1:] for e in VIDEO_EXT}
 # Files that are never anybody's business: hidden, forks, resume state, thumbnails.
 SKIP_NAME = re.compile(r"^(\.|#|dl_state|@eaDir|Thumbs\.db|desktop\.ini)|\.!q$")
 # Show-level metadata keeps its own name at the series root; season-level at the
@@ -556,7 +559,7 @@ def anchor_of(path, stem):
             base = os.path.basename(src)
             for prefix in (os.path.splitext(base)[0], base):
                 if stem == prefix or stem.startswith(prefix + "."):
-                    if best is None or len(prefix) > best[1]:
+                    if best is None or len(prefix) > best[2]:
                         best = (src, dst, len(prefix))
         if best:
             return best[0], best[1]
@@ -568,6 +571,11 @@ def sidecar_name(r, src, dst):
     carry — hung on the video file's new base."""
     stem = os.path.splitext(os.path.basename(src))[0]
     tail = os.path.splitext(r["base"])[0][len(stem):]
+    # "Show.S01E01.mkv.srt" carries the container's name, not a flag: Jellyfin and
+    # Plex both read "Show S01E01.srt", so the container word is dropped here.
+    parts = tail.split(".")
+    if len(parts) > 1 and parts[1].lower() in CONTAINER:
+        tail = "".join("." + p for p in parts[2:])
     if r["ext"] in NFO_EXT:
         tail = os.path.splitext(os.path.basename(src))[1] + tail
     return clean(os.path.splitext(os.path.basename(dst))[0] + tail + r["ext"])
diff --git a/tests/media_shows.bats b/tests/media_shows.bats
index fd4029b..db5e349 100755
--- a/tests/media_shows.bats
+++ b/tests/media_shows.bats
@@ -54,6 +54,7 @@ setup() {
     # trailer: four things that have to end up in four different places.
     at "$SEASON/The.Examples.S01E01.Pilot.1080p.x265.mkv" 9000
     at "$SEASON/The.Examples.S01E01.Pilot.1080p.x265.en.srt" 200
+    at "$SEASON/The.Examples.S01E01.Pilot.1080p.x265.mkv.forced.srt" 250
     at "$SEASON/folder.jpg" 300
     at "$SEASON/Trailers/teaser.mkv" 1000
     at "$SEASON/tvshow.nfo" 400
@@ -143,6 +144,12 @@ PY
         = "$LIB/The Examples (2010)/Season 01/The Examples S01E01.en.srt" ]
 }
 
+@test "a subtitle that carries the container's word in its own name still follows the episode" {
+    plan
+    [ "$(dst "$SEASON/The.Examples.S01E01.Pilot.1080p.x265.mkv.forced.srt")" \
+        = "$LIB/The Examples (2010)/Season 01/The Examples S01E01.forced.srt" ]
+}
+
 @test "a season image keeps its own name; a series nfo keeps the series folder" {
     plan
     [ "$(dst "$SEASON/folder.jpg")" = "$LIB/The Examples (2010)/Season 01/folder.jpg" ]