Samantha Carter
Played by Amanda Tapping , she appears in all three shows in the franchise: "Stargate SG-1" , "Stargate Atlantis" , and "Stargate Universe" . 
<triplet> Stargate SG-1 <subj> Amanda Tapping <obj> cast member <triplet> Stargate Atlantis <subj> Amanda Tapping <obj> cast member