Fringe (2008)

S2E10 Grey Matters

The First Wave infiltrates a psychiatric facility and successfully treats a long-time patient with schizophrenia. As the Fringe team delves into the incident, Olivia uncovers that the group's leader possesses one of the heads that went missing from cryogenic storage months prior. Concurrently, two additional patients are also cured of their schizophrenia, leading the team to discover that something has been extracted from each of their brains. Walter becomes crucial in uncovering the true intentions of First Wave and what they aim to achieve.