Read more about Mirai Gohan at: Wikipedia

Official Site: Funimation

is a single-episode special based on the Dragon Ball manga series. Originally airing in Japan on February 24, 1993, between episodes 175 and 176, the special is based on an extra chapter of the manga series. It depicts an alternate version of the future in which Goku dies from a virus and a teenage Trunks tries to defeat the Androids ravaging Earth.

The special begins with Goku's tragic death from a viral heart disease and the death of the Z-Fighters at the hands of Android #17 and Android #18 six months later. Also, the Dragon Balls are permanently useless due to Piccolo's death. Thirteen years later, an older Trunks and Gohan appear. Gohan, now a Super Saiyan, repeatedly tries to challenge the Androids but they are too strong. He begins training Trunks, who is eager to defend the Earth. As an overflow of emotion is required to push a Saiyan to Super Saiyan, Gohan tries to strike emotional chords in his pupil.

The Androids attack an amusement park. Gohan transforms and battles them, but is being overwhelmed. Trunks comes to his aid and fights Android #18, but is easily defeated. Gohan saves him and they hide in some debris. Unable to find their targets, the Androids bomb the entire area and leave. Trunks and Gohan survive, but Gohan loses his left arm. They go home where he recovers and then resume Trunks' training.

Just as the training is finished, a huge explosion hits the city. Gohan pretends to agree to allow Trunks to join him in the battle, then knocks him unconscious and goes alone. After a long battle, the Androids kill Gohan. Trunks awakens and hurries to the city to find Gohan's body laying face down in a puddle of water. His rage at the death of his best friend triggers his transformation into a Super Saiyan.

Mirai Gohan has not been a contender in any CBUB matches.