Dragon Ball Z: Cooler's Revenge

In this movie, Frieza's older brother Cooler is introduced. The film begins with a flashback to when Frieza destroyed Planet Vegeta, and Cooler's ship picks up Goku's space pod escaping the system. Cooler calls off the order to have it destroyed and lets it go, believing it to be no threat to him. More than twenty-five years later, Cooler unexpectedly discovers that his brother was killed by a Saiyan, something he disregards at first, believing that no Saiyan could generate enough power to kill Frieza. Cooler shows no compassion for his fallen brother, but is angered that someone in his family was slain by a Saiyan, and thinks that Frieza has dishonored the Cold Family name by doing so. Soon after, Cooler and his "Armored Squadron" go to Earth with the plan to kill the Saiyan who damaged his family's honor. Upon arrival, his forces ambush Goku and his friends on a camping trip, and after battling Salza, Neiz, and Doore, Goku is wounded by an energy blast launched by Cooler that was meant to kill Gohan, although he had enough strength left over to counter with an energy blast at Cooler, which he effortlessly parried, to which Cooler then realized that he was most likely going to survive and then tried to finish him off with a Death Flash, but he escaped underwater. This encounter leads him to speculate that Goku might be a Super Saiyan, and thus explains how Frieza lost to Goku. Undaunted, he tells the Armored Squadron to find them and destroy them.

Icarus reawakens Krillin during the aftermath of the battle, and Krillin wonders where Goku went. Meanwhile, Goku and Gohan emerge near a bank only for Goku to pass out from his earlier injury from Cooler. Goku and Gohan take shelter within a cave, but they were eventually sealed away from a cavein due to Doore, Neiz, and Salza blasting the landscape due to paying attention to detail, in an attempt to destroy Goku and Gohan. Despite this, it failed to kill them, a fact Cooler realized and told them that, although he would personally prefer ensuring Goku was dead by blowing up Earth, he'd rather see his death with his own eyes. Meanwhile, Krillin, Oolong, and Icarus, while hiding from the Armored Squadron's searches, searched for Goku until Icarus, picking up Gohan's scent discover the cave Goku and Gohan are trapped under, although they narrowly managed to avoid drawing Neiz's attention by using a ki beam to bring down the rock pile blocking the entrance.

After Krillin sets up shelter in a small cave with Goku, Gohan flies off to obtain Senzu Beans from Korin on his tower. After obtaining the beans, he is ambushed by the squadron, but just as he is about to be mercilessly beaten, Piccolo arrives on the scene and saves him from the beat-down. Piccolo proceeds to battle the warriors, and effortlessly kills Doore with a homing energy blast. He continues to fight Salza and Neiz, but is trapped for a moment in Neiz Bind Wave allowing Salza to chase down the fleeing Gohan. However, Piccolo proves far to powerful for the attack to work on him, and he backfires it on Neiz, which kills the warrior. Piccolo then ambushes Salza in a forest, but Cooler arrives and blasts Piccolo through the chest.

He then orders Salza to track down Gohan as a near-dead Piccolo falls to the ground below, with Piccolo, thinking that Cooler was Frieza, claims out of shock that [Frieza] should have been dead before being blasted multiple times. Gohan arrives at the cave with the Senzu Beans a short time later, but Salza arrives and destroys the bag just as he is about to give them to Krillin. An outraged Krillin attacks Salza but proves no match for the elite warrior, and as Krillin is smashed down, Gohan comes to his aid, but not before giving Goku the extra bean Yajirobe had thrown to him. As Gohan charges at Salza and proceeds to be thrashed around, Goku is healed with the spare bean. Goku walks out of the cave much to the surprise of Salza, who was just heading over to finish the wounded fighter off. Cooler arrives moments later and during a conversation, Salza attacks Goku to absolutely no affect. Goku powers up and Salza is sent hurdling into a rock face. Goku then charges at Cooler, and the titanic battle begins.

After several minutes of a somewhat even fight, Cooler tells of his history with his younger brother Frieza, and how he always hated his "spoiled brat" of a brother, and that he was planning on killing him himself one day. As the conversation continues, Cooler reveals that Frieza always had the edge in strength until Cooler found a transformation beyond his brother's. The tyrant then reveals his final transformation, and proceeds to pummel Goku easily. Even with uses of the Kaio-ken and the Kamehameha, Goku proves no match for the transformed power of Cooler, and finds himself completely outclassed.

However, as Cooler threatens to destroy the planet, Goku once again channeled his fury to become a Super Saiyan. Cooler finds himself, like Frieza was, grossly outclassed, but summons a trump card in the form of a Supernova (the same attack Frieza used to blow up Planet Vegeta, and the one he used to attempt to kill Future Trunks) to destroy Goku and the Earth. However, after a stint of struggling, Goku eventually manages to send it back with a Super Kamehameha, sending Cooler hurdling into the sun. As Cooler curses Goku, he realizes that Goku is the Saiyan he let escape over two and a half decades ago, and that he could have prevented this fate by killing the Saiyan child when he had the opportunity. Cooler then disintegrates and seemingly dies in the sun.

Goku, drained after his battle, is found by Krillin and Gohan. They are searching for the injured Piccolo when Salza reappears, and attempts to attack them. However, before he can attack, he is run through and killed by a Special Beam Cannon from a distance. Gohan looks around for Piccolo to no avail, and the movie ends with Piccolo staring at the sun and drinking some water, his wounds fully healed due to his regeneration ability.

in my opinion this is cool