The Princess Bride.

Kermit - Westley
Miss Piggy - Buttercup
Gonzo - Inigo
Fozzie - Fezzik
Rizzo - Vizzini
Uncle Deadly - Count Rugen
Dr Bunsen - Miracle Max
Beaker - Valerie
Sam - the Impressive Clergyman
Swedish Chef - the Albino
Rowlf - Grandpa/Narrator

Fred Savage would reprise his original role. Humperdinck would be played by Benedict Cumberbatch.

“Anybody want a peanut? Waka waka!”