Kevin is rejected by a butterfly and tries to dig a tunnel to hell, but he unearths a talking skull who wants to hang out. Tanya and Ernesto clash with the butterflies, and Kevin fails to invite his friends to laser tag.
Tanya and Kevin romanticize the ancient world. Ernesto takes them to a museum to show them how terrible times were, but instead they find an eccentric museum curator and a series of coincidences linking them to the past.
Kevin's dinner party is interrupted by feuding inter-dimensional warriors who seek his secret sauce. Ernesto and Tanya start a pop-up kitchen to sell the sauce to the warriors.