The penguins and Lumpy Space Princess were seen betting on the walruses during the race. LSP bet for Walrus #5. When noticing Walrus #5 slow down during the race, LSP gets frustrated and hits the walrus, which infuriates it and results in it trying to eat LSP. Gunter comes to the rescue; however, this turns around and Gunter ends up in between its teeth. After getting surrounded by more penguins, Walrus #5 throws Gunter out of its mouth, and the penguin gets his head split open after knocking an ice spike. This releases a green, other-worldly brain out of Gunter's head.
Walrus #5 has the appearance of a normal brown walrus. It wore a fat green ribbon around its body during the races.
Walrus #5 is seen to act aggressive when aggravated and also tried to eat Lumpy Space Princess and Gunter during the walrus race.