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Getter Robo Armageddon, known in Japan as Change Getter Robo!! (真ゲッターロボ!!, Chenji Gettā Robo!!), is an OVA released between August 25, 1998 to May 25, 1999 by Bandai Visual and was animated by Brain's Base and Studio OX. The OVA is based on the manga and anime series Getter Robo, created by Ken Ishikawa and Go Nagai. The series adapts numerous elements from previous installments of both the Getter Robo manga and anime entries, in addition to other elements from Ken Ishikawa's library of work, but is an independent story from any other installments. imdb.com