Gregg Moonstone, a very large man, was a member of a secretive Terran Confederacy military unit, alongside Gustav Lorca, Kon Rennie, Romy Pyrius, Jupiter Ross and Banta West. Pyrius was unsure if this was his real name.
In 2483 he and the rest of the team raided a meeting to kill the targets. However, Pyrius, a drug dealer, had hatched a side deal which compromised the mission.
The other organization captured Pyrius and Moonstone. They intended to tamper with Pyrius' drugs and have him assassinate their own targets that way. They tested their product on Moonstone, killing him. Pyrius was the only survivor of the original mission.