Shin Getter Robo vs Neo Getter Robo is an anime OVA series based on the works of Go Nagai and Ken Ishikawa. It was released in four episodes on four DVDs ranging from December 2000 to June 2001.
Shin Getter Robo vs Neo Getter Robo draws heavily from Ken Ishikawa's manga Getter Robo Go. An anime adaptation of Getter Robo Go was made in 1991 but has no relation to Ishikawa's manga aside from sharing the titular robot and pilots. Neo Getter Robo features much more faithful versions of Ishikawa's characters, but with a new plot and new Getter.
Discotek Media announced the North American license to the anime on March 13, 2012, and plans on releasing the series to DVD and Blu-ray.