In S14E13 ("Coon vs Coon and Friends"), Crunch's origins are revealed by a hologram (?) of his alien father (similar to Superman's discovery of his own origins). He reveals that Bradley's true name is Gok-zarah, and he is from the planet Kho-kha-jun (sp?):
"Your home planet, Kho-kha-jun (sp?), is known throughout the Universe for its berry mines... berries that have the power to fuel nearly anything. Needless to say, when the Mint Hunters of Kho-khen-ra (sp?) came along, our fate was already sealed, Gok-zarah. Our two worlds collided, and soon -- Mint and Berry were One." 
After learning this about himself, Crunch accepts his powers, as well as his responsibilities -- and proceeds to fight and defeat the dark lord Cthulhu.