Build-It Brock must use his skills to fix a fiasco when a bridge breaks while Peoplemover Penny is shuttling kids to a school show-and-tell day.

Flicker finally gets a mega mission for himself. But will the jumbo-sized balloons he needs to deliver be too big of a task for the tiny train?

Milo has two big repairs to fix in just one day! Will getting a rocket booster make him finish his tasks faster or just spark more trouble?