The friends investigate a bicycle that is taking up the entire bike rack, but discover that it may be a ghost bike, which Kevin says is a thing. Ernesto tries to prove he is a good friend to Tanya, but he’ll have to face his fears first.

Tanya and Kevin romanticize the ancient world. Ernesto takes them to a museum to show them how terrible old times were, but instead they find an eccentric museum curator and a series of coincidences linking them to the past.

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.

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, fueling their epic battle and delaying Kevin’s dinner party even more.

The friends run into an old acquaintance who’s achievements inspire Ernesto to rethink his entire life and exercise routine. But his efforts are derailed by unforeseen events, improbable accidents, and poor bicycle safety.

Kevin seeks a peaceful lifestyle after befriending a pair of tranquil manatees. Worried that their friend is drifting away, Ernesto and Tanya try to foster a calming environment at the apartment, but Turt has summoned dark forces there.

Tanya leads her friends into a mysterious backyard forest to avoid doing her DMV paperwork. Ernesto puts off sending a difficult email, and the friends awaken an ancient entity who has been procrastinating her duties for centuries.

In a hidden island kingdom Ernesto seeks adventure and Tanya pursues an old adversary. But Kevin is wary of their guide, a fancy seagull who promises champagne and good times.

Ernesto and Tanya clash over creative differences while recording an electronic album, leaving Kevin to navigate their different visions during a chaotic recording session at Tanya’s apartment.

A dangerous monster appears in the bathroom at Ernesto and Kevin’s apartment, forcing them to use the half-bathroom. Ernesto becomes trapped in the half-bathroom, and enlists Tanya’s help to defeat the monster and reclaim the full bathroom.