After "Da Maddest, Baddest Scientist" cancels an appearance the store, Gavin and Stuart try to convince Harold to fill in. However, he refuses to, so Gavin decides that Stuart should.
Meanwhile, Skyler gets diamond earrings from Eddie, her ex-boyfriend, instead of what he was supposed to send: her grandfather's watch that she let him wear when they were together. Skyler calls Eddie demanding the watch back, and he convinces her to meet him at a bar. However, Gavin volunteers to get it back instead. After Gavin leaves, Katrina invites Skyler to her knitting group so she can talk to people who know what she's going through, and Skyler reluctantly agrees.
Later, Gavin goes to the bar and demands the watch back, and Eddie gets upset that the relationship is finally over. Eddie then mistakes Gavin for a player, and the two begin to bond.
Three hours later, Stuart arrives as the Wizard of Physicstan, and Harold finds his magic tricks and costume to be terrible, so he decides to take over. Gavin also returns without the watch, and Skyler is furious. Gavin explains himself and compliments Eddie, causing Skyler to reconsider dumping him. Stuart then heads off to get the watch back. He arrives at the pub in normal clothes and demands the watch. However, Eddie begins complimenting him, which sidetracks him. Meanwhile, after spending some time at the knitting group, Skyler decides to get the watch back herself.
When Skyler demands the watch from Eddie, he starts seducing her, but the knitting group arrives to help her. After being threatened, he finally gives it up.
Later, when Harold gives his science performance for the kids, it goes well until he tells them that radiation is everywhere and they will all eventually die.