Castleman built a reputation as a can-do soldier who was charged with many important duties, from reconnaissance to retrieval of essential personnel -- often risking life and limb on off-world missions.
PLAYED BY -
FIRST APPEARED - Solitudes
Solitudes - Hoping to track down O'Neill and Carter, Castleman seriously injures himself on a mission after falling several meters from a ledge.
The Serpent's Lair - Castleman is charged with briefing teams about to travel through the Stargate to the new Alpha Site.
The Fifth Race - Castleman is temporarily reassigned to command SG-1 while Colonel O'Neill succumbs to the Ancient's repository download.
Fair Game - Castleman leads the base defense force in removing all weaponry and assists in general security of the S.G.C. during the Goa'uld negotiation process.