Ep. 4: Cumber's Tail Strategy and Fu's Intervention in the Battle

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Goku and Vegeta attempt to cut off Cumber's tail to revert him, but the giant form defends itself effectively. Future Trunks joins the fight but is defeated by the Golden Great Ape. Goku survives being crushed by transforming into Super Saiyan Blue and attacks with Kaio-ken x20, though Cumber remains unfazed. Meanwhile, Fu monitors the conflict from his laboratory until the Prison Planet's barrier sustains critical damage. He arrives at the battlefield to intervene, declaring he will control the situation. Fu absorbs energy from the artificial moon into his sword and strikes Cumber, forcing him to revert to his normal state. After easily dodging a counterattack, Fu departs, allowing Goku to transform into Super Saiyan God as Cumber recognizes the new power.