Episodes of Star Trek, are stories aired on television, usually forty to fifty minutes long excluding advertisements, although some specials are of twice that length.
Information shown on episodes of Star Trek is usually considered canon, whereas information from other sources (including, but not limited to, comics, novels, and video games) is generally considered non-canon.
For episodes listings by series including links to relevant non-canon articles see:
Episode also refers to a chain of episode or storyline missions types in Star Trek Online. This is not considered canon since these are events from a video game. For a listing of episodes from Star Trek Online see: