Former leader of the Trickyoutrons, Magentatron had been pretty crazy and full of blood lust, which is weird because robots don't bleed. When the Arranged Fight had finally ended, he gave up his mantel of leadership for a quiet peaceful life, playing Yu-Gi-Oh with a bunch of puny nerds. When he became too good at it (either by winning or crushing his victims, you know, peacefully), he reached out to his old booty call, Lord Solarscream.

Instead of a rough night of Robo-sexual sex, Lord Solarscream offered him a position on his newly formed team. Magentatron was very interested, but only if he could be allowed to control all magenta things. Lord Solarscream said that would be fine because it was last year that there was a guy controlling magenta things, and he did alright, but this year there was no one doing that.

Magentatron hopped on his space bicycle (because he turns into a gun, not a vehicle) and sped across the cosmos to play on the team.