The Time Zipper is a magical zipper from Dave the Barbarian.
In Dave the Barbarian
The zipper gets its power from being hit by a comet, bombarded by a laser, doused with chemicals, struck by the Norse God's power, bitten by a radioactive grasshopper, and learning how to cloud men's minds from a monk. Ned uses it to go to Udrogoth. It was later used to summon a T-Rex to battle Dave, but that plan backfired. It was last used by Dave to send Ned back where he came from.