Episode of Bardock

Dragon Ball Episode of Bardock' is a three-chapter manga created by Naho Ooishi. It was release into a anime special. It is based on the video game Dragon Ball Heroes. This special features a spin-off scenario taking place after the events of Dragon Ball Z TV Special 1, in which Bardock survives the destruction of Planet Vegeta and is sent into the past, combating Frieza's ancestor Chilled, and turning into a Super Saiyan.

Plot
Bardock tries to attack Frieza while the tyrant is in space above his spaceship with Zarbon and Dodoria. They have a short conversation. Frieza says he is sick of working with Saiyans and launches a Supernova to blow up Planet Vegeta. Instead of dying, Bardock wakes up in a bed on a planet that looks a lot like Planet Vegeta. He is being treated by two aliens: Ipana, the village doctor, and his son Berry. Bardock remarks that the medicine used to heal him is similar to the fluid in Medical Machines and Ipana says that the name of the planet is Planet Plant, so Bardock starts to wonder if he is in the past.

Two soldiers named Toobi and Cabira arrive in a spaceship and declare they are going to conquer Planet Plant. Bardock confronts and kills Cabira with a powerful roundhouse kick to the face. An enraged Toobi tries to punch Bardock, but the Saiyan dodges and kills Toobi using a Change the Future-like technique. The mayor and the villagers come to thank him, but Bardock flies away to hang out in a cave.

Berry arrives at the cave with a basket of food his father told him to take to Bardock. At first, Bardock tells Berry to leave, but he eventually eats the young alien's food. Berry comes back again with food multiple times, and Bardock seems to be growing tolerant of him. Meanwhile, a member of Frieza's race, Chilled, says it has been ten days since they have not heard from Toobi and Cabira, so he decides to investigate Planet Plant himself.

Chilled arrives on Planet Plant with eight soldiers, but immediately kills one of them because he was standing in front of him. Then, he has the idea to impersonate the Galactic Police and, wearing white cloaks, he and his soldiers go to meet the indigenous population of Planet Plant.

They arrive at the place where Ipana is healing a young kid with his special medicine, and Chilled remarks that the fluid has the power to heal wounds instantly. He and his soldiers tell the population that they came in pursuit of a pair of evildoers who were targeting Planet Plant for its abundant resources. The Plants say that Bardock already took care of the pair, and Chilled tells them that they will get a nice reward if they allow him to meet Bardock.

Looking at Chilled, Berry remarks that he has blood on his right arm. Afraid, he goes to the cave where Bardock is hanging out. While Berry is telling Bardock that he has a bad feeling about the aliens who are in the village, Chilled and his men start terrorizing the planet. Berry then begs Bardock to help them, and Bardock accepts, remembering his friends' decimation on Planet Meat.

Bardock saves Ipana from the soldiers, and when he sees Chilled, he confuses him for Frieza and angrily attacks him with a punch to the face. Chilled counterattacks by giving Bardock some kicks, then he begins to crush him, saying that he is the mightiest being in the universe.

With Bardock's energy dropping fast, Chilled prepares to deliver the finishing blow, but Berry leaps forward in an act of courage to save him. However, Chilled notices this and shoots him with his Death Razor technique to eliminate the Plant for good. Seeing this, Bardock becomes infuriated. For a short second, Bardock's anger causes him to see Chilled as Frieza, remembering his betrayal of the Saiyan race, and he becomes determined to avenge his crew and his newly found friend.

Bardock obtains a tremendous amount of energy, formed into waves flowing through his body, and with his might, he turns into the almighty Super Saiyan. The two warriors continue fighting, but with Bardock's newfound powers, he easily defeats Chilled and his minions.

As a last resort, Chilled throws a Death Ball at Bardock, intending to kill him with the last gasp of his energy, but it is pushed back by Bardock's Rebellion Trigger. With an extra push, Bardock also joins his own remaining energy with Chilled's, making the final blow and sending Chilled into the depths of space. The villagers cheer on Bardock, proud of his fantastic efforts, and Bardock smiles and gives them a thumbs up.

Later on, however, Chilled is seen floating through space, barely alive. His spaceship's men quickly take care of him, putting him under respiratory assistance. As he recovers he recalls back this incredible transformation, and informs his crew to warn his descendants about it (presenting how Frieza's family came to know about and fear the legend of the Super Saiyan).

When the three chapters were reprinted in the April 2012 issue of V-Jump, two additional pages were added to the end of the third chapter: they show Bardock thinking back to his crew and walking into the sunset, as he does in the movie adaptation.

Trivia
all information on Dragon Ball Episode of Bardock came from http://dragonball.wikia.com/wiki/Dragon_Ball:_Episode_of_Bardock
 * This is the only manga/anime in the series in which Goku does not appear, although he does appear on the poster and is mentioned at the beginning of the episode by the narrator.
 * In one of the promotional posters, Bardock's tail as Super Saiyan changes its color but in the OVA, the tail remains in its natural color.