After Joe Sweek is murdered by a hood swinging from a rope in a nearby warehouse, the Green Hornet plans an unscheduled visit to racketeer boss Alex Colony to propose a partnership with him in his ""accident"" racket.

After reporter Pat Allen is killed at the Daily Sentinel by a leopard, Britt Reid finds a transmitter in a cigarette box. Later, D.A. Scanlon informs Britt of the discovery of a perfect diamond on Allen's desk. Digging around, Reid discovers that the gemologist had been working on producing synthetic diamonds.

A scientist predicts crimes with a computer that implicates the Green Hornet.

Private Investigator Nat Pyle informs Brit that he has proof, for a story, that presumed dead racketeer Glen Connors, is still alive. Shortly later, Nat is found floating dead in the harbor from a possible boating accident. The Green Hornet thinks otherwise and finds a special interest, because..... Glen Connors framed the Green Hornet's real father.

An illegal bootleg liquor ring devised by Dirk forces a stronghold on bars in the town to buy from them. As reporter Mike tries to follow a lead to the racketeers, he becomes kidnapped. Don't look up or you'll spot Dirk in his helicopter dropping bombs on his non-conformants, his preferred method.

Seems that wealthy and prominent members of the community have been executing crimes and then forgetting that they ever happened. Eventually the District Attorney and The Green Hornet find that Peter Eden, owner of the Vale of Eden, has been leaving ""suggestions"" in these people's subconscious dreams after receiving treatments from the Vale of Eden.

Part two picks up with a GREEN HORNET visit and proposition for Peter Eden, owner of the Vale of Eden. After Peter uses Vanessa Vane to double-cross the Hornet, the Hornet re-visits Peter and uses his own dream machine on Peter to foil the last crime for the evening.

A charity art auction of fine paintings at Britt Reid's home is interrupted on live television by three masked, gun toting criminals. The police, nearby, manage to wound one of the thieves, but before they can arrest the other two, a laser ray is unleashed on their squad car with devastating results. The Green Hornet and Kato find themselves in quite a confrontation against this roving killing machine.

Organized crime's ""Protection"" Boss Duke Slate decides it's time to acquire the oriental businesses in town and uses Low Sing's gang to handle his influence. Low Sing, a martial arts professional, instructs his craft to his gang using the actions of a caged Preying Mantis, analogizing its intricate moves to proper Kung-Fu application. After a kidnapping, engineered by Low Sing, a challenge between Low Sing & Kato results in an interesting result.