The program starts with some interesting information about the worlds biggest bomber the B-36 Bomber aircraft, enough to fascinate any young airplane enthusiast.

With the startling revelation that Bill King was the man who whistled and who had caused the temporary disappearance of Tank Tinker The mystery of the Vanishing men came to an abrupt and astounding end.

Now the next morning, Hop and Tank are flying a cargo run to New City and Gail has come along. The new adventure, The Riddle of the Ghostly Avengers is about to begin.