Dragon Ball Heroes Episode 5, which is currently available at Chia-Anime, featured the one-sided battle between Son Goku and Evil Saiyan Cumber. Despite transforming into Super Saiyan God, Son Goku is still no match against Cumber, who is only in his base form. After a brief exchange of blows, Cumber succeeded to send Son Goku to the ground and completely buried him with a powerful energy ball.
The Ki that Cumber unleashed was powerful enough to break a chain in the Prison Planet. Cumber followed up with four small Ki blasts that left Son Goku unconscious. Luckily, when he was about to launch another energy ball, two strong fighters came to block the attack and save Son Goku. Dragon Ball Heroes Episode 5 featured the return of Super Saiyan 4 Son Goku: Xeno and the first appearance of Super Saiyan 4 Vegeta: Xeno. According to Mai, both Saiyans are members of the Time Patrol.
Before they tracked Cumber's location, Son Goku: Xeno and Vegeta: Xeno first headed at Fu's headquarters and destroyed the equipment he used for his experiments. Cumber realized that both Saiyans are strong and decided to level up his power by transforming into Super Saiyan. All of them are shocked to see how strong Cumber's aura is.