Archie buys a pair of mystical fuzzy dice for his beloved car, Betsy, and unwittingly brings her to life when he hangs the dice on her rear-view mirror.
Archie and the gang get a taste of what it's like to deal with teenagers when Mr. Weatherbee, Mr. Lodge and Miss Grundy drink bottles of contaminated water, causing them to revert to their wild teenage selves.
When a thief steals a time travel device from Dilton's lab, Archie finds himself trapped in a time loop where he relives the same horrible day over and over again, always ending with the same disastrous date with Veronica.