Jemma Simmons

Jemma Simmons is a female Human who is a English-born Starfleet Security Reserve agent and scientist. A genius biochemist, she is one of the youngest and most prominent members of SSR’s research division, along with her friend and partner, Leo Fitz. She, along with Fitz were recruited to Coulson's team and worked with them on all of their missions. While on the team, Simmons became friends with teammates Skye and Grant Ward. During the HYDRA Uprising, Simmons was an active participant in hunting for John Garrett and the rest of the Centipede Project. She was shocked and saddened to learn that Ward had been a member of HYDRA. Despite the events surrounding the Battle at Cybertek and Fitz's severe injury, Simmons stayed with the team to help rebuild SSR as Nick Fury requested.

As Coulson began to rebuild SSR, she became aware that her presence was impeding Fitz's healing and took an undercover assignment to infiltrate HYDRA but returned to SSR when Raina broke her cover.