Star Trek: Voyager (1995)

S02E16 Meld

Stardate: Unknown. Tuvok embarks on a mind meld with Lon Suder, a troubled individual who has taken a crewmember's life, in an effort to assist him. However, this connection triggers a shift in Tuvok, causing him to exhibit increasingly aggressive behavior. As time goes on, these violent impulses escalate, leading Tuvok to a point of losing his grip on control.