Below is the official Fringe synopsis for episode 5 of Season 3, entitled Amber 31422.

The alternate universe Fringe Division investigates a shocking breach of security when a twin frees his brother (guest stars Shawn and Aaron Ashmore) from a quarantined Amber area. As the team sets out to crack this sophisticated case, Walternate experiments over there more with Olivia as she reenters the tank. Meanwhile, visions of Peter continue to haunt Olivia about returning to the “other side”.

Fringe is taking a one week break on Sky One, so this episode will air Tuesday 9th November at 10pm.

Here’s the US trailer –

httpvh://www.youtube.com/watch?v=HvxxU8ZJMfA