He appears as a crudely drawn version of Patrick Star, but he is much smarter.
He first appears lying to the Flying Dutchman, making him blame SpongeBob and DoodlePants. However, later, SpongeBob and DoodlePants convince the Flying Dutchman that Doodle Patrick is the liar. He then appears as the boss of the Deep Sea.
He has a very easy strategy. He rolls around the screen and occasionally jumps off it and falls down, causing a shockwave to roll across the ground on both sides. He also runs around the room. It is very hard to hit him. The only second to hit him is when he is not doing anything.