B-14 HOW IS FREEZA DEFEATED?
In becoming a Super Saiyajin, Goku becomes much more powerful than Freeza. After a fist-fight, Goku decides the fight is getting boring. Freeza throws two homing Kienzans, one eventually slices himself in half. However, Freeza survives the ordeal, and comes back as a cyborg. He rushes to earth with his father to kill off everyone there before Goku reaches earth. In the original timeline, Goku teleports off his space capsule and kills Freeza. In the timeline that we follow, however, Trunks shows up and dices Freeza, and then kills King Cold, Freeza's father. (Trunks is a Super Saiyajin from the future, BTW.)