Shown at Jump Festa 2012 hold in December, 2011. 
Bardock, Goku's father who was suppose to die when Freeza's attack hit him along with the Planet Vegeta, he was sent way back in time, where the planet was inhabited by a strange creatures. There, after a while he met Freeza's ancestor, a space pirate named Chilled and fought him to protect the planet.

Dragon Ball: Episode of Bardock is a three-chapter manga created by Ooishi Naho and based on the video game Dragon Ball Heroes. It features a spin-off scenario taking place after the events of the TV special Dragon Ball Z: Bardock - The Father of Goku, in which Bardock survives after his confrontation against Freeza and turns into a Super Saiyan. 

Goku is back with his new son, Gohan, but just when things are getting settled down, the adventures continue. Whether he is facing enemies such as Freeza, Cell, or Boo, Goku is proven to be an elite of his own and discovers his race, Saiyan. He meets many new people, gaining allies as well as enemies, as he still finds time to raise a family and be the happy-go-lucky Saiyan he is. 
(Source: Anime News Network)

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