Bubbles is a talking dolphin and the (former) secondary antagonist turned supporting character in the hybrid movie The SpongeBob Movie: Sponge Out of Water. He is voiced by Matt Berry, who also voiced Moominpappa.
He is "the protector of the galaxy" and he is the one who help SpongeBob and friends get to the surface. He also appears in the video game version of the movie.
He is a tall and slender dark gray bottle nose dolphin. Unlike most sea animal-based characters, he is the size of an actual bottle-nose dolphin, easily dwarfing the average Bikini Bottomite.
When he speaks, he occasionally makes uncontrollable dolphin noises. Under the rank of 'The Watcher,' he wears a rosewood red robe with small light yellow double-platted shoulder pads, a golden zipper, and a tall golden collar. After being fired, his attire consists of a white cape with soft blue outline being held by a golden collar with a coin on the front containing an eye.
Bubbles' constant raging chirp is a reference to the infamous episode Sailor Mouth Where dolphin chirps are a cuss word (or censor a cuss word).