Time's up for two stars of 24. Penny Johnson Jerald and Sarah Wynter — whose respective roles as Sherry Palmer and Kate Warner were pivotal last season — will not be returning as series regulars for Day Three this fall, TV Guide Online has learned. A Fox spokesman refused to confirm the demotions, but did caution that "it would be a mistake to infer from an actor's contract status what their participation in the show next year will be. For example, Xander Berkeley (George Mason) was hired as a series regular last year but his character was killed off in episode 15." Yeah, that sucked for him.