No one eats Cthulhu. Cthulhu is a goddamn superduper-badass. Cthulhu can make everyone mad and clinically insane just by appearing in our dreams.
Galacticus on the other hand is just some
wannabe-miscreant who even can't handle a bunch of free-time-heroes.
Galacticus wouldn't even win against Cthulhu's janitor who keeps R'lyeh intact.
NO ONE BEATS CTHULHU! (excepting Chuck Yoda-Norris maybe...)
PH'NGLUI MGLW'NAFH CTHULHU R'LYEH WGAH'NAGL FHTAGN!
Iä! Iä! Cthulhu fhtagn! MUHAMUHAHAMUHA!