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.

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