Same actor, different character
- Same actor, different character
In some cases an actor remains on a television series while playing a different character than they did before.
- Personality erasure, wherein a character's identity changes, but the part does not require a new character with a distinct "body".
- Multiple roles, sometimes requiring special effects or body doubles, to allow one actor to play against herself. Lucy Lawless did this many times on Xena; Alyson Hannigan played a vampire Willow from a parallel universe, and Nicholas Brendon also played two Xanders in the one episode (with help from his twin brother).
- Personality swaps, often for comedic effect; see, e.g., when Faith & Buffy switched bodies; when Callisto & Xena switched bodies; "Out of Their Minds" on Farscape.
See also:
- FreakOut on TV Tropes wiki