Season 2: Golden Frieza 2

 Frieza and Goku continue their protracted battle with Frieza landing more blows on Goku than can be returned. Unable to match Frieza's raw power, Goku manages to withstand and dodge Frieza's attacks. Goku and Vegeta notice that Frieza is progressively losing stamina and that his power level is dropping, though Frieza himself fails to notice this. Vegeta urges Goku to quickly finish Frieza off before he has a chance to recover, or he will step up and do so himself. After Goku and Frieza exchange some sarcastic banter, they power up again and continue their fight. Frieza still has the upper hand, but Goku realizes he only needs to stall Frieza long enough for his weakness to reappear. After a fully powered Frieza unleashes a barrage of attacks, he quickly becomes tired and starts running out of breath, with his attacks no longer hurting Goku. Frieza finally realizes his weakness; a lack of endurance, as his Golden form exhausts more energy than he can produce. Goku explains this is because Frieza rushed to Earth immediately after achieving the Golden form without giving himself enough time to master it. Frieza agonizes over his failed chance at revenge in combat, but mouths a few inaudible words to Sorbet for assistance. Goku tells Frieza to leave Earth while he still can - but to everyone's surprise, a laser beam pierces Goku's chest from behind, fired from Sorbet's ray gun. Stomping on Goku's chest wound to make him scream, Frieza gloats about his backup strategy to have Goku let his guard down, mocking him by claiming Goku's overconfidence prevents him from being the strongest fighter. Before Frieza can unleash his killing shot on Goku, Vegeta fires at Frieza and announces that it is his turn to fight.  Goku is critically injured, but Vegeta intervenes before Frieza can deliver a killing blow. When Krillin attempts to deliver Goku a Senzu Bean, Frieza attempts to blast him - but Vegeta redirects the blast to Sorbet, killing him. Afterwards, Vegeta demonstrates his own ability to transform into a Super Saiyan Blue. Frieza attempts to land a hit on Vegeta but fails to do so and, already exhausted from his fight with Goku, Frieza quickly finds himself completely outmatched by Vegeta. Enraged and humiliated, Frieza refuses to accept defeat and, while Vegeta powers up a killing shot, Frieza instead fires an attack at the Earth and destroys it out from under them. Whis protects Goku and the others, but Vegeta and everyone else on the planet are killed - with Whis suspecting Frieza survived and escaped through his ability to breathe in space. As Goku laments his failure to stop Frieza and protect Earth, Whis offers to turn back time by a couple of minutes and allow Goku one last chance. The moment is reset to the end of Vegeta and Frieza's battle, allowing Goku just enough time to charge up a Kamehameha attack and kill Frieza, saving the world. Later, the group gathers at Capsule Corporation, where Piccolo is revived with the Namekian Dragon Balls. Shaken by his helplessness against Frieza, Gohan tells Piccolo that he intends to resume his training so that he can protect his loved ones, which Piccolo is delighted to hear.