Looney Toons - Area 52!
The otherwise forgettable Looney Toons: Back in Action may have failed on its promise to breathe new life into its classic stars, but the "Area 52" scene makes it all worthwhile. There's little more to it than this clip, but Marvin the Martian unleashes a whole host of aliens from containment, each one lovingly lifted from a different science fiction film or television series. You've got Universal's Metaluna Mutant, a Triffid, the Daleks from Dr. Who, Ro-man the ROBOT MONSTER, and one of my beloved Fiends! for several of these weirdos, it marked their first cinematic appearance in decades.
Thank you, uploader, for cutting short the wabbit's cringefully unamusing one-liners.