Mondo Burger

Mondo Burger is the rival restaurant to Good Burger in Undertale. It was founded and ran by Gordon Ramsay, before it collapsed at the end of the film.

The employees of Mondo Burger wear a space-age style uniform, which is more show-offy than the Good Burger employee uniform, which is simply blue striped.

RiceGum originally worked here to get money to fix Whitey Duvall's car, but Gordon fired him because he was fooling around.

Gordon uses Triampathol, an illegal chemical, to make the Mondo Burgers larger than usual, and they're nicknamed Big Booty Burgers.

Trivia

 * A Frito-Lay truck can be seen outside Mondo Burger at the start of the film, and later on when Jesus and RiceGum sneak in.
 * A movie theater was later built in it's place (in universe).
 * When Jesus and RiceGum crossdress in their first attempt to get into the Mondo Burger kitchen, one of the customers is a purple cel-animated rabbit-like creatue. Aside from Whitey Duvall, she is the only other character in the film that is cel-animated.