Higeki no Mach 3.5 Daisakusen
Joe and the professor go to the presentation of a new civil aircraft called Mach 3.5 designed by a brilliant Japanese scientist, Prof. Doyama. The aviation managers decide to entrust the new vehicle to Joe, who will become its first pilot. The Gailarians, hearing the news, decide to kidnap the professor to take possession of his creation. Joe, on reconnaissance with Kaori, Professor Doyama's daughter, discovers the alien attack but too late. The professor has disappeared and the boy ends up in an ambush by two alien soldiers who also manage to kidnap the hostage's daughter. The Gailarians also manage to recover the missing element, i.e. the superfuel necessary for the operation of the Mach 3.5. Rita goes into action with little Tobè who, driving the auxiliary drill of the Groizer X, recovers Joe who manages to destroy the enemy plane.
Aired 05/08/1976EP 6 - Higeki no Mach 3.5 Daisakusen
Groizer X
The Gaira aliens, hidden in the Arctic, plan to conquer Earth. Captured and forced to work for the aliens, Dr. Yan creates the ultimate weapon, a transformable aerial robot called Gloizer X. Entrusted to his daughter Rita, Gloizer X escapes the clutches of the Gaira and lands in Japan, where pilot Jo Kaisaka meets a wounded Rita. Taking up the controls of Gloizer X, Jo and Rita fight against the Gaira invasion.