Red SpongeBob is an alternate universe version of SpongeBob SquarePants, who is from a universe where SpongeBob is red instead of yellow. He may be from the same universe as Green Patrick or Plaid Patrick.
He looks exactly like SpongeBob, except he is red, his chin is pink, his freckles are yellow, and he wears a yellow and green horizontally striped head band.
He is the first alternate universe character that SpongeBob summons to the Bikini Bottom 2 universe after Sandy Evil-Cheeks.
He appears when SpongeBob summons the second alternate universe character, Blue SpongeBob. He also appears when SpongeBob summons the next three, who are Green Patrick, Plaid Patrick, and Patrick Star.
He then later appears at the end in the crowd of alternate universe characters. He appears next to Patrick Star and Plaid Patrick, and is behind Blue SpongeBob.