Mystery (Vacation) of the Unknown

Mystery (Vactation) of the Unknown is a two-part episode of Cartoon City Revolution. In it, some person (Alt. Doofenshmirtz) invites some people for a special dinner when it's actually a trick so he can capture some people.

Part 1
At the city, a mysterious mailman (The Platyborg himself, Alt. Perry) sends in invitation to a special dinner from some guy named Mr. Anonymous (Alt. Doof) at the house called House of the Unknown. At SpongeBob's house, SpongeBob recievies the invitation and goes to his garage. At the garage, Patrick, Squidward and Sandy also recieve the letter, including Stanley S. SquarePants (in the previous season and this season and the SSBB Cartoon Force films, he's not accident prone anymore and nothing gets destroyed if he touches). While at the unknown house, the anonymous person (AKA Mr. Anonymous) reveals himself as Alternate Doofenshmirtz!