'Archie Meets Glee,' Part 3. Dilton Doiley invented a machine that opened a wormhole between Riverdale and an alternate, mirror-verse with kids exactly like the Archie gang. Now Dilton and his new BFF Artie are trying to rebuild the Portal-Porter before the delicate balance between universes is disrupted by a kiss between star-crossed teens. Even the possibility of a Betty-Puck romance would set off a chain-reaction of cataclysmic events ending with not one, but two worlds imploding!