The Fringe team in the parallel universe is alerted about a breach in the system. The alternate versions of Charlie and Olivia (aka Bolivia) go to check it out with another agent, Lincoln Lee, who uses equipment to monitor an “event.”
Charlie discovers a man whose face is covered in tumors in a theater where they are monitoring the event. Bolivia (alt world Olivia) and Lincoln are confused by the man’s belongings. “Who the hell is Jackson?” Lincoln says, looking at the former President on the $20 bill. The alternate world agents do not see Walter, Olivia and two other people as they sneak away and out of the theater.
In a flashback 36 hours earlier Walter watches surveillance footage of Walternate (Walter in the alternate universe) taking Peter to the other side. Walter and Olivia remember that the Observer told him Peter must never go to the other side.