As a robot, Jenny wants to experience what it is like to dream. When Dr. Wakeman installs a dream chip, Jenny's joy causes her to abuse its function and she finds herself stuck in dream mode and sleepwalking, causing mayhem in the process.

Turns out, poor Sheldon was stuck on the aliens' ship when Jenny got rid of it (in the previous episode), and he's been spending decades trying to get back to Earth (even though it's only been a short time on Earth since he left). Hopefully, Jenny can get him back to his proper age.