Cut to the present
After the TOP, everyone is eating at Bulma's; we see the scene from Trailer 1 where Whis asks Goku why he wants to get stronger
Goten and Trunks see Freeza's minions stealing the Dragon Balls on the security cam (not all of them)
Goku and Vegeta go to the tundra place to secure a Dragon Ball (to keep it away from the thief)
Cut to Broly who is stranded on Planet Vampa
Broly is a bit socially stunted due to growing up with only his father
Freeza's ship arrives; Lemo and Cheelye find Broly but they are scared of him because he is a Saiyan; they scout him and their scouters blow up
Broly and Paragus go to the ship where they meet Freeza
Freeza remembers Paragus, and remembers that he has a grudge against Saiyans so he decides to take them to Earth
When they arrive, scenes from Trailer 1
Broly attacks Vegeta first
Broly does not know how to go Super Saiyan so he fights in base for a while
Vegeta is kicking his ass at first (in SSG), but Broly keeps getting stronger
Eventually Vegeta gets his ass kicked, and Goku steps in
Goku fights him, eventually goes SSG and SSB
At first, when he goes SSB, it seems Goku will win
Then Freeza remembers how Goku went SS when he killed Krillin, so he decides to kill Paragus
It's super effective; Broly goes SS and destroys Goku
Piccolo gives Goku a telepathic pep talk
Goku grabs Vegeta and teleports to Piccolo
Piccolo won't give them a senzu for some reason
Goku suggests fusion
This is about the halfway point of the movie