Fringe Season Two Episode Four: Momentum Deferred

24 fans were probably happy to see Curtis again on last night’s Fringe, even if he is playing a weirdo who steals frozen heads from cryonics labs. The fringe team is called when his shape-shifter accomplice is killed in a robbery and bleeds mercury. They also realize that this is a different shape-shifter than one who tried to kill Olivia, meaning there could still be someone after her and he could be anywhere. (This is before they realize fake Charlie is …