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Coby, Bud, and Lori first became involved in the world of the Transformers when Landmine arrived on Earth and they encountered him; aspiring mechanic Coby helped to repair the damaged Autobot, whom they soon befriended.
As time went by Coby and Lori developed a mutual attraction to each other as well as a love of adventure and space travel. In the series finale the pair promised that they would meet again in space one day, on which occasion Coby proposed to Lori. The pair were later married on Earth with various family and friends-human and Cybertronian-in attendance.
Coby is introduced in a similar role in the Cybertron manga, where he believes in the existence of Transformers before ever encountering one.