Putting together a time capsule is fun and Richie and his friends find themselves very much enjoying creating a 1950s style one to be found by future generations.
All goes well until they try to decide where they can store it. Howard agrees to let them keep it in the vault at the hardware store which is as safe a place as any but, while placing it there, they accidently shut the door and find themselves locked in.
Typically, everyone panics and worries about air and food supplies, everyone except Fonzie who is remarkably calm, which is just as well given the agitated state of the others.
This episode has very little to recommend it, it's dull almost from start to finish, unfortunately.