The premiere was quite a good episode. The Clarkes, The Crawfords and the Keys are all introduced in this episode.
The main character is definitely Owen Crawford. You see how he doesnt anything he can so that he can get to the alien project. He kills his fiancee, marries his superior daughter to black mail him.
Another important character is John. John came with the main aim of getting Sally Clarke pregnant and he succeeds.
We also see Russel Keys gets abducted by Aliens, and has nightmares about such. All his colleagues die and only he remains alive. By the end of the episode Jesse Keys is a baby boy, whilst Jacob Clarke is conceived.