Slappy and the Stinkers

"Five Kids. One Sea Lion. No Rules."

Five 2nd-grade kids who don't follow strict rules by their school principal Brinway are dubbed "Stinkers" by him. On the class visit to an aquarium the Stinkers decide that a sea lion called Slappy doesn't feel too good there, "free" him, and plant him into Brinway's hot-tub.