Major with the United States Marine Corp., originally in command of SG-3. Castleman has built a reputation as a can-do soldier who is charged with many important duties, from reconnaissance to retrieval of essential personnel.
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FIRST APPEARED -
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KEY EPISODE(S) -
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.
