yt-dlp -f bestaudio --extract-audio --audio-format mp3 --audio-quality 0 "URL" This downloads just the audio. You can then mux it into your video. Dedicated audio track websites exist but change frequently. Search for: "Series Name S01E01 English audio track download"
Here’s a properly structured post for a forum, Reddit, or blog on how to download English audio tracks for TV series. How to Download English Audio Tracks for TV Series (Complete Guide) how to download english audio track for tv series