I would be thrilled to report that I loved “Plankton: The Movie,” a “SpongeBob SquarePants” spinoff film. I'd love to say that it is the cinematic hit of the spring. Alas, I cannot.

SpongeBob SquarePants is an animated show that's truly stood the test of time: in the 25 years since it premiered on Nickelodeon, Stephen Hillenberg's animated series has spawned a fleet of ...