The answer to combating an alien invasion is misfit monsters in this week’s aptly titled Monsters vs. Aliens, a DreamWorks animated trifle that, for all its innocuous good humor, has little on Tim Burton’s screwy homage to ‘50s E.T. sagas, Mars Attacks! With more than a dash of Dr. Strangelove mixed into its silly period-sci-fi stew, Burton’s film concerns the unexpected arrival of spacemen intent on incinerating with ray-guns all of humanity – and cackling like little schoolchildren as they do it. The president (Jack Nicholson, in one of two roles) is at the head of a lunatic cabinet, a former heavyweight champ (Jim Brown) is determined to ditch his Egyptian-themed hotel gig and reunite with his wife (Pam Grier) and kids, and a Kansas teen (Lukas Haas) tasked with caring for granny winds up at the forefront of the interspecies fight, three of the many threads Burton casts with all-stars and crams into his overstuffed plot. Mars Attacks! isn’t often riotous but its postmodern use of ‘50s aesthetics in a clearly present day (circa 1996) setting proves both strangely natural and striking, as does its stabs at surreally wacko imagery, from the opening shot of cattle on fire running down a street, to the appearance of the Martians’ UFO armada. And while Burton’s satiric skewering is scattershot at best, the uninhibited madcap energy of his tribute-cum-big-budget-blockbuster nonetheless frequently makes it more amusing and inspired than that of the cheesy ‘50s B-movies (and bloated ‘90s summertime action-sagas) on which it deliriously riffs.