Science has discovered a medical breakthrough. A number of human illnesses are able to be treated through the use of byproducts from nuclear power, and Captain Video meets with a research scientist on the possibilities therewith.
The Captain's longtime craft the X-9 crashes on an asteroid while on a passenger-transport mission to the colony for rehabilitated prisoners on Ganymede, and the damages are determined to be beyond repair.
A newly-discovered, erratic comet appears to be on a collision course with Pluto. The crew aboard the Captain's new ship the 'Galaxy' mutinies en route, and the efforts to destroy the errant comet are thereby disrupted.
Venus is the next destination of the 'Galaxy', as the Captain and Video Ranger are assigned to calm a worsening rebellion among native inhabitants, one that the Solar Council fears could spread and ignite a space war.