Sarah

Sarah is a female Antari and is the captain of the spaceship in Part 1.

To get to her you need to find the notebook, which is located in Science Lab the room closest to the locked door to the Bridge. Arriving at the bridge, you will need to be an Antari yourself in order to seduce her.

Once you have brain-infested her, you will get the option to "Warp Speed Ahead" to gain access to the Space Station.

Interestingly although Sarah is the Captain of the ship in Part 1, Joan reveals later that both Sarah and the Space station were kept out of the loop about the details of the scenario involving Chet/Chloe's infestation. This seems to indicate that she holds a lower rank than both Joan and Rene or is possibly uninvolved in the Werm Project completely. This is reinforced by her own journal entry in the Science Lab where she describes a sexual encounter with Joan which is condemned by Antari culture. The fact that Joan is able to subjugate her with no repercussion lends credibility to Joan's being a much higher rank than Sarah despite the game referring to Joan as a soldier or security guard.