The Caldera is an episode in The Amazing World of Gumball.
When Miss Simian class students is camping in Yellowstone National Park, WY, they see that Yellowstone Caldera is erupted. Gumball, Darwin and friends must find an exit way.
Bobert: AAH! YELLOWSTONE CALDERA HAS ERUPTED!!!
(Miss Simian's class runs away from caldera)
Penny: Are they lost?
Darwin: We have to get out of here!