Dragon Ball Z: Fusion Reborn

In this action-packed adventure, a young demon's inattentiveness leads to a catastrophic event. The evil cleansing machine malfunctions and explodes, transforming the demon into the formidable Janemba. This monstrous entity poses a significant threat, prompting Goku and Vegeta to intervene. Initially, both Saiyans attempt to defeat Janemba on their own, showcasing their individual power and determination. However, their solo efforts prove futile against the overwhelming strength of the newly formed villain. Recognizing the gravity of the situation, Goku and Vegeta understand that their only chance of victory lies in the ultimate fusion technique, a desperate measure to combat the formidable Janemba.