How do you catch someone who can alter time itself? That's the question on the latest episode of 'Fringe' (Thu., 9PM ET on Fox). Alistair Peck (played by guest star Peter Weller) is a scientist with a troubled past. He has the ability to travel through time, and he wants to use this power to save his wife from a deadly accident. Unfortunately, by changing past events, he puts the lives of even more innocent people at risk.

Watch the video after the jump.How do you catch someone who can alter time itself? That's the question on the latest episode of 'Fringe' (Thu., 9PM ET on Fox). Alistair Peck (played by guest star Peter Weller) is a scientist with a troubled past. He has the ability to travel through time, and he wants to use this power to save his wife from a deadly accident. Unfortunately, by changing past events, he puts the lives of even more innocent people at risk.

And so the 'Fringe' team decides to stop him. But how can you stop a man who can literally jump through time? Can Walter (John Noble) and Olivia (Anna Torv) save the day? Or will they run out of -- well -- time?