Caves of Doom - Scientists and tourists are disappearing, and Marvel Boy is sent to the Grande Canyon to search for the answers.

The Serpent Strikes - A number of zoo keepers are dying when caring for reptiles, and it's up to Marvel Boy to crack the case.

Death from the Sky - A pilot is flying in a region known to be associated with disappearances when he encounters a species of cloud people.

Menace from the Moon - The first rocket to reach the moon and return has returned, by why has the radio been silent the entire time?

The Deadly Decision - Marvel Boy's father and friend have both been captured, and on two different planets. What happens if he fails to give them the information they seek?