United together, the four member of the Zoo Gang uncover an extortion racket who are targeting two married movie stars. The extortionists want the Morning Star, a rare diamond that the Martins have care of. The Zoo Gang decide to take out the crooks, but first they have to get their bhands on the well-secured diamond themselves.

• Reginald Rose
• Paul Gallico

• Brian Keith
• John Mills
• Walter Gotell