Jethro's running late for his graduation ceremony rehearsal despite his new watch. Mrs. Potts of Jethro's school is afraid that his attendance will jeopardize her chances for a new endowment from philanthropist Theodore Switzer. Mr. Drysdale and Mrs. Potts come up with a plan to have Jethro show up late to the ceremony. Skipper the chimpanzee takes Jethro's place in his sixth grade graduation ceremony, impressing Mr. Switzer.