Agent Jasper Sitwell is an agent of S.H.I.E.L.D. secretly working for HYDRA. He is a good friend of Phil Coulson and worked with him. He works at the Hub, when he catches Simmons snooping around in a restricted hallway, she stuns him with Fitz's night-night pistol. Jasper Sitwell was created by Stan Lee and Don Heck.