General Dogar orders Admiral Haruk to use his Viking underwater space robot to capture the Shark spaceplane and take Joe hostage. Dogar's strategy is successfully implemented and Haruk, despite having been the greatest friend of prof. Yan is forced to use the despicable weapon of blackmail by ordering Rita to return Groizer X and submit to the justice of the Gailarians. Rita, however, opposes the attacks of Dogar's spaceship and so the evil Gailar general orders Haruk to kill Joe. Surprisingly, Admiral Haruk frees Joe: his code would never have allowed him to disobey orders but his morals did. In a last act of heroic courage, Haruk sacrifices his life in the name of friendship: not even the cruelties of a war can erase such a noble feeling from the soul of a good man.