Unwillingly

Spongebob and patrick pranked squidward and squidward isn't talking to them anymore and they're bothered about it.

David hasslehoff stuffed squidward between his pecs and squished him really hard and squidward is now a cube of squid (no ward).

Spongebob is bothered about this and blames patrick. Patrick doesn't really know what happened or why.

Plankton thinks this is all because of him and is talking to Karen (his computer wife) and the two are just echochambering their own importance in levels of severity. He got one scene this episode and that explains why he isn't seen anywhere else.

Mr. Krabs is frustrated hes losing money because one of his employees is a cube, and his top guy (bob esponja) is too much in grief to continue working at the krusty krab.

Patrick still isn't really sure what's happening.

Gary and Shelly (the lesser known pet of spongebob) are squabbling over who is spongebob's number one pet. But one is in a cage and the other can only say "mrow" so the conflict doesn't really escalate beyond that.

Sandy Cheeks is just maintaining her dome and it's really nice. No real issues. 

Larry the Lobster isn't in this episode.

Plankton enacts a plan to dismantle the Krusty Krab, destroy the Krabby Patty secret formula and take over the world by burning King Neptune's throne and framing Mr. Krabs for the crime. SpongeBob and Patrick alongside others in opposition of Plankton team up to weaken Plankton before he can destroy the Krusty Krab and save Bikini Bottom from Plankton's rule.

He was indeed not ready