: Vegeta engages Broly first, but the savage warrior’s power grows exponentially as the fight progresses, eventually forcing Vegeta into his Super Saiyan God form.
Forty-one years ago, King Vegeta ruled the Saiyan race with a balance of pride and fear. When he discovered a baby named Broly whose power potential eclipsed that of his own son, Prince Vegeta, he felt threatened. To protect his lineage's legacy, the King exiled the infant to the desolate, monster-infested planet Vampa. Driven by fury, Broly’s father, Paragus, defected and followed his son, vowing to one day use the boy's burgeoning power to exact revenge on the royal bloodline. Dragon Ball Super: Broly (2018)
If you want to know more about the characters or the production, I can look up: The by Akira Toriyama : Vegeta engages Broly first, but the savage
: Goku and Vegeta encounter Broly for the first time, sensing a raw, primal energy they have never felt before. To protect his lineage's legacy, the King exiled
As Gogeta prepares a final, lethal blow, Chelye—a kind-hearted soldier who befriended Broly—uses the Dragon Balls to wish him back to the safety of Planet Vampa. The battle ends not with a death, but with a new beginning. Goku later visits Broly on his home planet, bringing supplies and expressing a wish to spar again as friends, famously asking Broly to call him "Kakarot".
The in the Dragon Ball Super manga and films
: Realizing neither of them can win alone as Broly's power shatters the very fabric of reality, Goku and Vegeta perform the Fusion Dance to become Gogeta. Resolution on Vampa