Assigned to the Stargate program after the aliens came back through the gate, she is a dedicated member of SG-1.
Having been the one to figure out the random selection program that chooses destinations and a power source for the gate, she is invaluable.
Sam Carter was engaged to Jonas Hanson, but broke it off and watched him be killed in the first season.
She has formed a good working relationship with all members of the team, and will do anything to help them.
Sam has been through her share of nasties as well. She has been a host to a Tok'ra symbiont, named Jolinar and her father is now part of the tok'ra. Although she didn't want to be a host, she has found this invaluable, because she can now sense Gou'ld symbionts.
There is a striking attraction between Carter and Colonel O'Neill, leaving the rest of the SGC wondering what will happen next..
