The Kraken is a giant sea monster that appeared in Billy & Mandy's Big Boogey Adventure.
He was summoned by the Boogeyman after all attempts to destroy Grim, Billy, Mandy and Irwin fail. He lives in a giant boulder with a garage door and a garbage can in front of it. He ate Billy (Billy survived under water for 6 hours by breathing his own farts) when he was under the control of the Boogeyman. He is very friendly once you get to know him (after Billy befriended him he helped them win the cannibal run). Creeper fears the Kraken.
He's a giant Agronaut with a dark blue rounded shell, round yellow eyes, purple skin and tentacles with 2 large ones that serve as arms. He apparently eats humans, but also ate a seagull after puking Billy out. Billy communicated with Kraken using dolphin like screeching.