It all started that Plankteegee creates his Robot Weegees to take over the Squidbob Universe. So, Squidbob has to destroy those evil Robot Weegees.
Plankteegee: At last! It's time to take over the universe!
Squidbob: Not on my watch!
Plankteegee: If you try to take me down you have to take down my guards first!