Tired of giving Star rides on his bicycle, Marco decides to teach her how to ride a bike herself. Star is excited about this at first, but as soon as she gets on the seat, she is afraid of falling over. Assuring Star that he will not let go of the seat, he teaches her how to coast. Once she starts riding, she instantly gets the hang of it until Marco reveals that he let go of the seat. Upset over Marco "lying" to her, Star begins riding frantically, and because Marco never taught her how to brake, she rides uncontrollably across town. Racing back home, Marco calls Star on her interdimensional mirror, and he learns that Star left her magic wand in her backpack. Taking Star's backpack, Marco enlists the help of Oskar Greason, who is parked in the Diaz family's driveway, to rescue Star. Glossaryck appears as well out of one of Oskar's textbooks, but he claims to be unable to help because this is not a magic problem. Oskar and Glossaryck start to be unhelpful as they bond over meatball subs and playing music, much to Marco's frustration.
As she rides uncontrollably through town, Star attracts the attention of several stray dogs, goes flying over a sinkhole, and pedals straight into highway traffic. Marco, Oskar, and Glossaryck eventually catch up with her, but Star refuses to listen to Marco because he lied to her earlier. Soon enough, Marco, Oskar, and Glossaryck come to a standstill due to the poor condition of Oskar's car. With Glossaryck's help, Marco hitches a ride on an invisible goat to save the runaway Star.
Marco catches up with Star again to help her stop, but Star argues his method of stopping is not how they do things on Mewni. Marco tells her she is not on Mewni anymore and reassures her that he believes in her. Thanks to Marco, Star is finally able to stop the bike. Oskar and Glossaryck catch up as well and Star offers to give Oskar a bike ride home since his car broke down. Marco tries hitching a ride on the invisible goat again, but he falls flat on his face because Glossaryck claims the goat left.
- Eden Sher as Star Butterfly
- Adam McArthur as Marco Diaz
- Jeffrey Tambor as Glossaryck
- Jon Heder as Oskar Greason
- Star's Mewberty wings are seen for the second time in this episode, followed by the episode of the same name.
Promotional and Concept