Super Electromagnetic Machine Voltes V: Volume 11

Included:

S01E21 The Fake Secret Base
October 22, 1977 TV Asahi
Dr. Gou was rescued by Voltes team after they infiltrated Zuuru's undersea base and then brought to Big Falcon, but Gou was suspicious. Soon he realized that all the Big Falcon, Voltes team, and even Sakunji were just fake dummies planned by Zuuru to get Voltes secret from him.

S01E22 The Traitor's Plot
October 29, 1977 TV Asahi
Zuuru tried to kill Heinell as he was sleeping but he failed and got caught. He was given one chance to save his life by pretending to runaway from Heinell and seeking refuge to Big Falcon and finally leading Voltes V into a trap. He succeeded in gaining Voltes team's trust and brought Voltes team into the planned trap and he tried once more to kill Heinell again. He failed and was shot to death.

Note: In the English version all titles and names are different.