Co-written by SuperSaiyan2Link.
Upon tending to Gohan and Krillin, and acknowledging the help Pan had done in protecting them, he turned his attention to the two Saiyans, as well as the bodies of Yamcha, Tien, and Piccolo nearby. He inquired where Chiaotzu was, to which Nappa joyously announced that Chiaotzu blew himself up in a pathetic effort to bring him down. After taunting that Chiaotzu and the others were nothing but weaklings, Goku grew enraged at Nappa, charging with a massive amount of ki, one that even gave Vegeta pause.
After stating to Nappa that his scouter gave Kakarot a reading of over eight thousand, Vegeta gave his comrade the order to attack. The two clashed, but while initially caught off-guard by Goku, Nappa soon seemed to adapt, nearly matching him. Trunks and the Supreme Kai of Time informed Pan that Nappa should've been far more overwhelmed and, while they anticipated Goku would ask her to let him handle this alone, Pan had to intervene. As predicted, Goku was hesitant in accepting her aid, though Krillin and Gohan plead with him. Nappa noticed Goku was heeding the words of his comrades, but after being knocked back, turned his attention back to his opponent, the two flying into each other and clashing in midair.
Nappa fired his Break Cannon from his mouth, which Goku made no attempt to dodge. As the attack dissipated, Pan collided with him, but Nappa blocked her attack. With both struggling to overpower the other, Nappa told Vegeta that the only explanation for this was that Pan was a Saiyan like the two of them. Just then, Vegeta shouted at Nappa to turn around, which he did, seeing Goku nearly untouched after the Break Cannon save for some searing on Goku's wristbands. Trunks feared Goku might've actually taken damage, unlike in history where his ki alone was enough to stop it.
In a rage after being ordered to leave Kakarot to Vegeta, Nappa went flying towards Gohan and Krillin. Pan flew in after him, grabbing hold of his tail, which he initially scoffed at. Just then, she stomped on his back with both her feet, then pulled his tail as hard as she could, actually causing Nappa pain in doing so. After Nappa elbowed and knocked Pan away, he flew in even faster, about to finish them. Pan heard Goku shouting "Kaio-Ken", flying in fast enough to intercept Nappa, striking his back, knocking him towards the ground, then catching him. This left Nappa crippled, unable to fight any longer and only able to crawl back to Vegeta.
Goku gave the two Saiyans the ultimatum of leaving Earth, but Pan heard Nappa asking Vegeta for help, and saw the Saiyan Prince putting his hand out to him. Once Nappa took it, he was flung into the air by his comrade, then, even amidst his begging, was obliterated by a blast. After witnessing Nappa destroyed by Vegeta, a grin on the Saiyan Prince's face, Pan began to wonder if this was all because of what Frieza did to him or if this was just how Vegeta was. It looked as though history was back on point when Vegeta glowed with a purple aura and struck Goku unannounced.
Trunks suspected whoever was manipulating his father wanted him and Goku to fight right then and there instead of a desert canyon Goku was supposed to lead him to first. The Supreme Kai of Time wasn't sure what Pan should do, as she freely feared even after her training that she was well below Vegeta's power. Pan simply asked if Trunks could direct her there himself and that she would handle it.
In mid-fight, Goku told Krillin and Gohan to leave, then asked Vegeta to fight him elsewhere. Vegeta wasn't moved, still attacking him, forcing Pan to blast at him with ki blasts. He swiftly avoided them while still battling Goku, to which she flew in close for a flurry. The Saiyan Prince blocked attacks from both her and Goku before a palm rocketed her to the ground. During this, Goku found an opening, landing his first blow against Vegeta. Pan, getting up from a blow far stronger than Nappa's, began to fly off into the far distance. Goku noticed this and flew after her, Vegeta following soon after.
Catching up to her, Goku asked Pan if she also wanted to move the battle elsewhere, then asked her to follow him. Vegeta decided not to waste his energy attacking for the time being and followed suit. Upon arriving in the desert, Vegeta gave the two only a brief respite, announcing his superiority due to coming from a royal Saiyan bloodline. Once Goku rebuked this with the concept that even someone from a lower rank could challenge an elite, Vegeta questioned Pan as to why she was even involved to begin with. Trying not to give anything away, but needing to answer, she responded that she wouldn't let anyone else die.
Throughout their battle, Pan found herself barely able to keep up with Goku and Vegeta's battle, and even as she attempted to intervene, Vegeta simply avoided them or his sheer movements blew her backward. Realizing that Vegeta's power-up was getting the better of Goku even with Kaio-Ken, Pan tried something differently by using the Power Pole. As Vegeta caught a jabbing Power Pole with his hand, he taunted her about using a blunt instrument. Before he could fire off a blast with his other hand, Pan quickly shouted "Power Pole Extend", landing her first attack against Vegeta and pinning him to a wall. This also allowed Goku to knock him through several afterward, after which he noticed the Power Pole Pan held, stating that it reminded him of the one he used to wield.
Vegeta reemerged, this time on the offensive against Pan, his punches blocked by the Power Pole, but still knocking her backward. Robbing Pan of her weapon soon after, he swung it at her, putting a blunt cut on her back and slicing off her cape. After a knee to her stomach knocked her into a wall, Vegeta prepared to throw the Power Pole at her head, only for Goku to land a critical blow to Vegeta's armor. The thrown Power Pole barely missed her and lodge itself in the wall next to her as Goku unleashed a Kaio-Ken times three onslaught on Vegeta.
Goku returned soon after to check on Pan, the Kaio-Ken already taking a toll on him, until Vegeta recovered in a rage. Intending to end the battle then and there and destroy the Earth, he flew into the air for his Galick Gun, which Goku countered with the Kamehameha. Vegeta's power-up began to take hold, overpowering even Goku's Kaio-Ken times four power-up, and threatening to overtake his Kamehameha.
Pan didn't know if her own Kamehameha could help to turn the side, but knowing she had to do something, she flew upward behind Vegeta and began firing ki blasts at him. Though they all landed, none of them even phased the Saiyan Prince. With a more powerful charged shot, Pan finally harmed Vegeta enough to catch him off-guard, throwing off his focus long enough for Goku's Kamehameha to tear through his Galick Gun.
The two watched as Vegeta was sent far into the sky by the Kamehameha, followed by Yajirobe joining them. Pan saw Goku barely able to stand, and she and Yajirobe tried to help him stay upright. Despite Yajirobe celebrating their victory, Goku and Pan sensed Vegeta's survival and his impending return. Goku told Yajirobe to get to a safe distance, then watched as Vegeta hovered back down with a glowing object in his hand. After seeing Vegeta toss it into the sky, Goku and Pan witnessed in terror Vegeta growing in size and his face violently morphing, concluding with him towering over his opponents as a Great Ape.