|Played By:||Jaime Ray Newman|
A young lieutenant, who came to Atlantis on the Daedalus as part of the security detail, she was sent on her first mission along with Sheppard's team. However, whilst on the planet a Wraith Dart spots them and attempts to beam them. Cadman and Rodney McKay are unable to dodge the beam, and are taken by the Wriath beam.
In an attempt to free them Zelenka tries to materialises Rodney McKay, however Cadman's consciousness is inadvertently joined to Rodney McKay's body along with his consciousness. During the time, Cadman managed to figure out that she can control his body when he is asleep, a fact which she used to help him through a date with Katie Brown.
However, her feelings for Dr. Carson Beckett made it hard for her to stay focused inside his body. Eventually they discovered that over time one of the two will disappear, and with it being Rodney McKay's body, she agreed for it to be her. However, with the help of Zelenka, Rodney McKay managed to find a way to power the Wraith technology, so that it could separate the two. Before doing so, Cadman takes the opportunity to kiss Carson in the event that the experiment fails, fortunately it works, and she is separated from Rodney McKay.
When the NID warn the SGC about a Trust attack on Atlantis, Rodney McKay flips to the conclusion that the Spy is Cadman, however, her skills and abilities come in handy, and Rodney McKay is soon cleared of all doubt and the real spy is caught.
During her time on the base, she got closer to Beckett and also went on dates with him.