Tropes that apply to a particular single episode of a TV show. Not to be confused with the British sitcom of the same name.
Significant date episodeEpisodes that revolve around what the characters do (or not) to celebrate culturally significant dates, especially holidays.
Genre shift episodeThe show switches genres for one episode, but keeps the main cast.
Unusual location episodeEpisode where the main cast goes to places they don't usually hang out at.
Unusual situation episodeEpisodes where the main cast is placed into unusual situations.
Illness episodeEpisodes where members of the main cast fall ill or are injured.
Unusual activity episodeEpisodes where members of the main cast engage in unusual (for them) activities.
Contest/sports/game episodeEpisodes where the main cast participates in sports or other kinds of games and contests.
Character-centered episodeEpisodes focusing on secondary characters, personality traits of the main cast, exotic creatures, or even inanimate objects.
(Non-)Continuity episodeEpisodes important (or completely irrelevant) to the show's overall continuity.
Production trivia episodeEpisodes notable for unusual format or production details.