When John B’s supervision-free home life catches up to him, he receives a well-timed assist — and some spiffing up — from the last person he expects.

When John B’s supervision-free home life catches up to him, he receives a well-timed assist — and some spiffing up — from the last person he expects.

Dr. Alexei reveals what the Russians have been building, and Eleven sees where Billy has been. Dustin and Erica stage a daring rescue.