Oso leads agents Dotty, Wolfie, and Musa through a cave for his training mission. But he wanders off the path causing everyone to go down a sand slide. That's when a special alert comes in. Three girls--Marie, Charlotte, and Lisa--are preparing for a fire drill at school tomorrow, but they don't know what to do. Marie wants to ask her mother if they can do a practice fire drill, but she's too busy working. Oso will have to lead the girls to show them how to stay safe in case of a real fire.