Buried beneath that pineapple under the sea, Spongebob Squarepants keeps his dark cave, the underground, underwater headquarters for Darkbob Squarepants. And when Bikini Bottom turns as mean as Gotham City, Darkbob taps his pal Patrick to help him save the day.

This Spongebob/Batman mashup comes courtesy of Bill Mund, and I just love that he dressed Patrick as the Carrie Kelly Robin.

Darkbob Knightpants [Bill Mund via GeekTyrant]