There have been some great doubles in TV history over the years; Patty Duke and Spock come to mind. So what's it like for Anna Torv, star of "Fringe," to add to that tradition?
"It's been really fun," Torv told CNN on Friday at San Diego Comic-Con. The parallel world version of her character, Olivia Dunham, introduced at the end of last season, is impersonating the "real world" Olivia.
"I want to play her a little bit more," Torv said, "but now that she's back I don't know how much of her we're gonna see."
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