The Trick of Father Aiming at the Earth (Bouryaku no Chichi ga Chikyuu o Nerau- 謀略の父が地球を狙う) - S1.E13

Zuuru used voice machine to immitate Dr. Gou's voice and deceived Kenichi. When Kenichi was about to be kidnapped using tractor beam, Dr. Hamaguchi knocked him to the ground so it was Dr. Hamaguchi what was hit by tractor beam and held hostage in Sky Rook. Voltes cannot do much as their attack could mean Hamaguchi's death. Dr. Hamaguchi then managed to escape, but he got shot and crashed his airplane into the beast fighter.