Leopold James "Leo" Fitz is a fictional character that originated in the Marvel Cinematic Universe before appearing in Marvel Comics. The character, created by Joss Whedon, Jed Whedon and Maurissa Tancharoen, first appeared in the pilot episode of Agents of S.H.I.E.L.D. in September 2013, and has continually been portrayed by Iain De Caestecker. In the series, Fitz is one of S.H.I.E.L.D.'s top scientific minds. His scientific knowledge is vast, and as an engineer and inventor he has developed many of S.H.I.E.L.D.'s staple devices and gadgets. Many of his storylines involve his relationship with his best friend, and later wife, Jemma Simmons, who are collectively known as Fitzsimmons. Over the course of the series, Fitz suffers multiple traumas and becomes aware of a darker and more ruthless side to his character. His darker alter ego is commonly known as The Doctor.
Fictional character biography In season one, Leo Fitz is brought on to S.H.I.E.L.D. agent Phil Coulson's team as an engineering and weapons technology specialist. He has a close bond with fellow agent Jemma Simmons, whom he met at the S.H.I.E.L.D. academy, with both being its Science and Technology division's youngest graduates. Near the end of the season, Fitz and Simmons lock themselves inside a medical unit for safety from rogue agent Grant Ward, who ejects the unit into the ocean. While trapped, Fitz professes his feelings for Simmons before sacrificing himself to save her. They are rescued by Nick Fury, but Fitz sustains damage to his temporal lobe as a result of oxygen deprivation and is left comatose. In season two, Fitz initially struggles with technology and speech as a result of Ward's actions, but over time becomes a full member of the team again. Near the end of the season Fitz arranges for a date with Simmons when the Kree weapon called "Monolith", which is in S.H.I.E.L.D. custody, breaks free of containment and absorbs Simmons into itself. In season three, Fitz acquires an ancient Hebrew scroll describing the Monolith that consumed Simmons as "Death" (Hebrew: מות), which Fitz is unable to accept. Unknown to him, Simmons is alive on a desolate alien planet. Fitz realizes that the Monolith is a portal, and with help from the Asgardian Elliot Randolph and S.H.I.E.L.D. agent Daisy Johnson, is able to enter the portal. He finds Simmons and is able to rescue her just as Daisy's power destroys the Monolith. Simmons later tells Fitz about the six months she spent stranded on the desert planet. Fitz and Simmons eventually consummate their relationship. In season four, Fitz discovers that S.H.I.E.L.D. ally Holden Radcliffe has created the android Aida, and agrees to help perfect her, while initially keeping this from Simmons. When Fitz's consciousness is submerged in the Framework, a virtual reality created by Radcliffe, he becomes "The Doctor", Hydra's remorseless second-in-command, and has a relationship with Aida, who now goes by Ophelia / Madame Hydra. After he creates for Aida a machine to become a real person, Fitz is forced out of the Framework, and is traumatized from his behavior there. But when Aida learns Fitz does not love her back, she plans her revenge on him. S.H.I.E.L.D. eventually succeeds in defeating her. Shortly after, everyone in the team except Fitz are taken away by an unknown group. In season five, the team have been transported to a space station in the future, with only Fitz left behind. Fitz is taken into military custody, but broken out six months later with Lance Hunter's help. Enoch, a Chronicom, helps him escape to a secret bunker where Fitz learns that he was left behind so he could save the team. Aboard Enoch's ship, Fitz goes into stasis.
Future variant Seventy-four years later, Enoch awakes Fitz when they reach their destination. After Fitz and the team return to the present, Fitz and Simmons marry in a ceremony organized by S.H.I.E.L.D. Due to multiple stressful factors, Fitz experiences a psychic split which enables his "Doctor" personality from the Framework to temporarily resurface. During the final battle against a gravitonium-enhanced Glenn Talbot, Fitz is buried under a rubble and later found fatally injured when dug out by fellow agents Melinda May and Mack where he succumbs to his wounds. Simmons resolves to find the present version of Fitz, who is in stasis aboard Enoch's ship.
Present variant In season six, as Daisy and Simmons lead the search for Fitz, Enoch releases Fitz prematurely when they come under attack. They reach the planet Kitson, where Fitz and Simmons reunite until the assassin Malachi makes off with Fitz. For Fitz's safety, Simmons surrenders herself to Atarah, Enoch's former superior, so that the two of them can come up with a time-traveling method for the Chronicoms to use. Atarah traps Fitz and Simmons inside their own minds, forcing them to work together in figuring out time travel logic. The duo are ultimately freed by Enoch, who manages to overpower Atarah and her forces. The trio then teleport away, but end up again on Kitson, where Fitz and Simmons are saved from execution by mercenary Izel, who helps them on their return to Earth while Enoch bids them farewell. Izel believes Fitz and Simmons are conspiring against her, so she commands her ship's crew to eliminate them. The two are ultimately rescued by a team led by Mack, and return to Earth. While S.H.I.E.L.D stops Izel, Fitz and Simmons are ambushed by the Chronicom Hunters, but saved by Enoch who helps them achieve time travel as well as create a Coulson Life Model Decoy (LMD) to help them fight the Hunters. In season seven, Fitz stays behind while the rest of the team is transported to the past to stop the Chronicoms from invading the Earth. Through the journey of the team Fitz is seen missing but aiding the team in their mission, carefully plotting the perfect plan for the survival of the team and the entire human race. Toward the end Fitz finally teleports from the main timeline to the branched off timeline after Simmons assembles the device. Fitz then devises yet another plan to bring his friend and the enemy Chronicoms back to the original timeline, which he achieves successfully. The team along with Fitz successfully destroy the Chronicoms' invasion scheme. Fitz and Simmons reunite with their daughter Alya, and a year later, decide to retire from S.H.I.E.L.D. to raise Alya.
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