Leeroy-O was apparently assigned to retrieve, or otherwise deal with, a nuclear bomb in JHT Sector. Unfortunately, his team was lost during the communist uprising.

Due to a MemoMax liveware overwrite, Leeroy-O's mind ended up in the body of Mega-R-GUN-1, overwriting Mega-R's. In fact, for intents and purposes, he was Mega-R.

It is unknown where a true clone of Leeroy-O still exists.

Leeroy-O was forcibly removed from Mega-R's body and placed inside a bot.