Pipe Screams / Within the Walls of Madness (S02E04)

What begins as a simple drain blockage of tangled hair and soap residue quickly escalates into a much larger issue. A struggling plumber is called in to resolve the mess, but he soon discovers that the obstruction has a life of its own. Meanwhile, a classified government facility is being evacuated as the last remaining scientists scramble to control the creature they've been researching. However, the real danger may not be the creature itself, but rather one of the scientists involved in the project.