Colditz is a German mercenary.
Colditz was later hired by Doctor X to set up a fake separatist uprising in Guernsey, which was apparently foiled by Action Man. Colditz soon met with Storm Shadow, who told him nobody bore him ill will about Guernsey and invited him to Doctor X's Chateau. After the ninja disappeared, Action Man, who was spying on the two's conversation, leap into battle with Colditz. The mercenary held his own, till Action Man forced him into a pool, causing a device he planted on him to electrocute Colditz and take him out of commission.
Colditz was taken into Action Man Programme custody and Action Man was sent disguised as Colditz to infiltrate the Chateau. His failure to recognize the doorman, Colditz's former lover, set off the alarms and blew his cover.