On his way home, Will sees something terrifying; a sinister secret lurks in the depths of a nearby government lab.

Mike, Dustin and Lucas try to talk to the girl they saw in the woods; Hopper questions Joyce about a disturbing phone call.

Increasingly concerned, Nancy searches for Barb and tries to find out what Jonathan has been up to; Joyce thinks Will is trying to talk to her.

Refusing to accept that Will is dead, Joyce tries to connect with him; the boys decide to give Eleven a makeover; Jonathan and Nancy form an unexpected alliance.

Hopper gets into the lab; Jonathan and Nancy confront the force that took Will; the boys talk to Mr. Clarke about traveling to another dimension.

Jonathan frantically looks for Nancy in the darkness as Steve looks for her too; Joyce and Hopper learn the truth about the lab's experiments.