The Cyborg 009 team manages to reactivate Leonid's cyborg body, and he begins to regain his memories. However, his experiences as a captive and the trauma he endured have left him shaken. As he struggles to come to terms with his past and his new existence, the team helps him to recover and readjust to his life as a cyborg.
"The Lost File: Revival"
Black Ghost had been experimenting on Leonid, attempting to replicate the success of the cyborg project. However, their efforts resulted in a catastrophic failure, and Leonid's body was severely damaged. In a desperate bid to save his life, the scientists at Black Ghost merged Leonid's consciousness with an advanced AI system, erasing his memories and reprogramming him to serve as a sleeper agent.