A mystery in which Wishbone, the television dog, helps his friends Joe Talbot, Samantha Kepler, and David Barnes determine who has stolen the head from their school mascot's costume.

While helping Gladys Glendower fix up the old Moonlight Drive-In, Wishbone and his friends try to discover who is responsible for the series of mysterious fires that threaten to destroy the old theater.

When Joe and Wishbone take a mystery train ride to solve a pretend murder, they encounter a real crime that must be solved before the train arrives.

Wishbone imagines himself to be a wealthy Frenchman who must flee his homeland when war breaks out during the French Revolution.

When other players on the basketball team suspect Joe of playing the practical jokes which are destroying their morale, Wishbone helps his pal find the real culprit.

Wishbone and his friends try to find out who is threatening to destroy the exhibit of a newly-discovered dinosaur at the Oakdale College Museum of Natural History.

When Joe and David decide to use a computer to publish a sports newsletter that will outshine the one that the school produces, Wishbone is reminded of Mark Twain's story and imagines himself as Hank Morgan, a nineteenth-century American who travels back in time to King Arthur's court.

When the Drake brothers return to their hometown to make a movie about Oakdale during the 1880s and Joe lands a role in the film, someone tries to sabotage the movie, so Joe and Wishbone must catch the culprit before the production is canceled.

When an old basketball trophy disappears from the home of a new boy in town and one of their friends is suspected of being the thief, Joe and Wishbone determine to discover the truth about what really happened.

Wishbone ends up missing while trying to locate other missing dogs, and Joe must solve the case alone.