The other school kids, led by Melissa and Zack, throw a surprise birthday party for Milo at a go-kart arena.

The gang participates in a school event that combines both the academic and athletic decathlon.

When Melissa’s dad drives her and Milo into town on a decommissioned old fire engine, chaos ensues.

Milo and Melissa finally tell Zack the story of the infamous Llama Incident.