A scientist invents a filter that can increase the power of a laser beam, turning it into a death ray! A dangerous crime organization wants the device and will stop at nothing to get it, while murder and violence follow Joe and Tom to Singapore as they try to foil the evil plans.

Two rivals are out to recover a cache of stolen jewels. The thief who originally stole them has just gotten out of prison, however, and he is looking for his twin brother, who knows where the jewels are hidden. Complications ensue.

Hidden somewhere deep inside a volcano in the mysterious South American mountains lies the legendary lost kingdom of the Incas. And buried in this kingdom is a fabulous treasure of inestimable value.

Roccia and a band of fellow gladiators join forces with a patrician named Glaucus Valerius to replace Nero, (and his evil henchman, Tigelinus), with a new emperor: Servius Galba. During the course of this bloody struggle, the gladiators lose their mentor and trainer - Resius - and then must rescue Lidia, Resius' beautiful niece, from death on the cross.