Fringe (2008)

S1E12 The No-Brainer

Olivia, Walter, and Peter are summoned to probe the mysterious death of a car salesman discovered in a pool of a strange "goo," reminiscent of another case occurring far away. Walter's analysis uncovers that the substance is actually brain matter, prompting the team to unravel how the murderer is able to liquefy human brains. As more victims emerge, the investigation uncovers a shocking connection among them. Simultaneously, Olivia is filled with dread when the case endangers someone close to her.