Fringe/Recap/S02 E02

Season 2, Episode 2:

Night of Desirable Objects
The Fringe team investigates a spate of disappearances and learns that a retired scientist has turned his son into a killer mutant creature as a by-product of helping the child to be born from a sick mother. During the investigation, Olivia finds that her hearing is becoming overly sensitive, she's nervous with her gun and she still can't recall her time on the other side, so for the sake of her mental health, Nina Sharp recommends that Olivia visit a man named Sam Weiss, the one who "put [Nina] back together" after she lost her arm. Weiss runs a bowling alley in Boston and has no formal qualifications, but has (what Olivia later describes as) a Yoda-like vibe and he pushes her to be more persistent. He also warns Olivia that soon she'll start getting severe headaches. At the end of the episode, the Shapeshifter posing as Charlie contacts the other side and is ordered to help Olivia regain her memories.