Tomas Calderon is a S.H.I.E.L.D. agent. Despite the heavy casualties S.H.I.E.L.D. took during HYDRA's attack on the agency, he stayed loyal to his oath and continued his service in the remains of S.H.I.E.L.D. under Robert Gonzales. However, as another faction of S.H.I.E.L.D. led by Phil Coulson emerged, Calderon supported an attack on their new-found competitor. Once Coulson's base was taken over, Calderon was injured during an attack against Skye.