Samantha Carter is an astrophysicist, engineer and pilot who was the operational leader of the Atlantis expedition for one year after playing a key role in bringing the Stargate Program into the Multiverse as a member of Allied Joint Military. Considered Stargate Earth's leading expert on the Stargate and a host of other alien technology, Jack O'Neill once emphatically proclaimed her brain to be a national resource. She was part of the Ciz'loikki Conflict and Great Serethan-Allied War.