Season 1 of Zone Fighter premiered on April 2, 1973.

The evil Garogas plan to take over Earth with their army of giant Fearbeasts. They are opposed by the members of a family from a planet called Peaceland that was also destroyed by Garoga. They use a variety of exotic vehicles and weapons but their primary weapon against Garoga is the oldest child Hikaru, who is able to transform into the giant Zone Fighter.