[7] The film is unique for switching from monaural VistaVision (1.85:1) to Quadraphonic CinemaScope (2.35:1) when the Yamato enters the Double Galaxy.

Scaldart warns the Yamato crew that they cannot return to their own time otherwise they will meet their fated end, and offers to let them stay on the future Earth.

The crew is initially confused why the Black Nebulans would attack them if their fate is already decided, until Sanada deduces that the future Earth they saw was actually an elaborate ploy by Scaldart to trick the Yamato into surrendering.

Realizing that the Black Nebulans aren't bluffing about their willingness to destroy Earth, they turn back to look for the bomb's control system.

They decide to attack the false Earth with the Wave Motion Gun, which destroys its facade and reveals its true nature as the planet Dezarium.

Sasha then contacts the crew and informs them that she can open a vent to allow the Yamato to attack Dezarium's core directly with the Wave Motion Gun, which will destroy the entire planet, but Scaldart threatens to detonate the bomb on Earth.