Dr. John Karmedy, originally Dr. Torii (鳥居博士) in Japanese, serves as a scientific advisor and researcher for the anti-dinosaur organization D-Force. His expertise proves crucial in developing cybernetic enhancements and combat systems after protagonists sustain critical injuries during a prototype super-tank test explosion. He oversees medical and technological procedures enabling their synchronization with the Izenborg system. Throughout missions against dinosaur threats, he provides ongoing technical support and strategic guidance to the team. The character maintains this role across all 39 original series episodes and the compiled English-dubbed film adaptation, with strictly professional involvement focused on D-Force's operational support and no documented character evolution or expanded backstory beyond his scientific function.