New Teen Titans (Volume 2) #19 April, 1986.

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Cyborg, while fighting alongside Changeling, is incapacitated by Changeling's stepfather Mento. As Changeling tries and fails to reason with Mento, Cyborg shoots Mento with his arm cannon knocking him out. Cyborg loses consciousness and Changeling brings him to Dr. Klyburn for medical assistance.