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Leopold "Leo" Fitz

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Leopold "Leo" Fitz
Season(s) 1
First Appearance "Pilot"
Occupation Engineer
Affiliation S.H.I.E.L.D.
aka "Fitzsimmons" (when with Jemma Simmons)
Status Alive
Portrayed by Iain De Caestecker

Leopold "Leo" Fitz is a weapons and technology expert and engineer working for S.H.I.E.L.D..


Early LifeEdit

A genius engineer, Leo Fitz went to the S.H.I.E.L.D. training academy with his best friend, Biochem genius Jemma Simmons. Among their instructors were Professor Vaughn and Professor Hall, who taught chemical kinetics during their second year.

Sometime after college, Jemma dragged Fitz into going on a field assignment.

Field WorkEdit

Leo and Jemma were recruited by agent Phil Coulson to be the science crew for a new team he was putting together. Stationed on the Bus, the pair have designed specialized equipment and compounds on the fly in various emergency situations.

Their first foray into the field involved the case of Michael Peterson, a man in danger of exploding due to his use of the volatile Centipede formula. Peterson was saved in part by Fitz's efforts to create a Centipede counter-agent for Peterson.

Fitz faced danger in the field in Peru, where the team was investigating an 0-8-4. Fitz and the team escaped Peruvian rebels only to face an armed takeover of the Bus. Working with the team, he helped take back the Bus and secure the old hydra weapon.

Soon afterwards, Jemma Simmons was infected by a Chitauri helmet virus. He tried extremly hard to find an antidote, and he did in the end, but Jemma didn't know. Jemma hit Fitz on the back of the head with a fire extinguisher so she could jump from the 'Bus' to save the others, without Fitz following her. Fitz tried to parachute after her, but Grant Ward beat him to it. Fitz showed remorse that he wasn't the one to rescue Jemma after the events. Nevertheless Jemma thanks him and kisses him on the cheek.

Fitz went into the field with Ward afterwards. The mission was to destroy a weapon called the "Overkill Device " that was able to make weapons go off on great distance. However, there was no extraction plan. Fitz proved his bravery in this episode over and over, ultimately helping Ward fight their enemies. Coulson and the rest of the team evacuated Fitz and Ward once they did their job.


Gemma kissing Leo on the cheek in FZZT
Jemma kissing Leo on the cheek in episode FZZT
Leo is socially awkward, but despite his awkwardness, he gets along remarkably well with his research partner, Jemma Simmons. The two of them are stated to be similar to inseparable siblings.[1] It seems that he is either jealous when he sees Jemma with another guy or very protective of her.


Leo is a brilliant engineer. He is a weapons/technology specialist, making gadgets to help agents in the field.[2]



Fitz: I'm engineering, she's bio-chem.

Fitz: So, uh, uh, when... When you get back, I'll show you my thing. A thing. It's not-- I-It's my hardware. My equipment! Let's... hang up.
Simmons: You wanna make something awkward, copy Fitz.

Phil Coulson: What's Fitz doing over there?
Jemma Simmons: He detected a strange energy coming off the body.
Phil Coulson: He's afraid of it, isn't he?
Leo Fitz: It's the smell.
Jemma Simmons: There's no shame in it, Fitz! It's perfectly natural to be afraid.
Leo Fitz: No, the only thing I'm afraid of is putrid decaying flesh corrupting my pristine workspace. [Jemma rolls her eyes] Do you remember the last time you brought a dead thing into the lab?
Jemma Simmons: Oh, not the stupid cat again.
Leo Fitz: The cat, tell him about the cat!
Jemma Simmons: And it's our lab, not yours!
Leo Fitz: You left its liver next to my lunch!
Phil Coulson: Guys! Can we please...?

Phil Coulson: Any idea what could cause an effect like this?
Jemma Simmons: There's the soliton hypothesis-
Leo Fitz: Well, okay, judging by the horizontal-
Jemma Simmons: Perhaps nano-batteries-
Leo Fitz: ...electrical discharge could be-
Phil Coulson: Time. Let's try again. Any idea what could cause an effect like this?
Jemma Simmons: Hell if I know.
Leo Fitz: Uh, no, no clue.

"The Hub"
Ward: [Disables an enemy and sees more arriving] Fitz! More Border Patrol!
[Fitz has already gotten out of the car and started running]
Fitz: I'm already moving! HURRY UP!

"The Well"
Ward: Don't say I never gave you anything.
Fitz: Checking for alien spectrographic signatures one teeny rock at a time.
Ward: Necessary precaution. We don't want anything alien getting in the wrong hands.
Fitz: Still, this is definitely the type of work a monkey could easily do.
Ward: You're our little monkey.

Fitz: Time will come when you won’t make fun of me for that. You’ll be jealous. You’ll be jealous wrinkly old hags.

Skye: Fitz, have you ever heard of an 0-8-4 being a person?

Fitz: No, but I suppose it's possible. I'd hate to meet the guy.


  • Simmons: Best friend and coworker (possible love interest)
  • Agent Ward: Friend and coworker (Big brother sibling rivalry seems to be developing)
  • Agent Coulson: Superior officer
  • Agent May: Superior officer
  • Skye: Friend and co-worker



  • His current ID badge serial number is A 0947329; the card was issued on 5 February 2013, and will expire on 5 February 2018.
  • His favorite sandwich is prosciutto and buffalo mozzarella with a hint of pesto aioli. (The Hub)
  • Fitz-Simmons named their eight flying gadgets after Snow White and Seven Dwarfs. 00 is Snow White, 01 is Doc, 02 is Sleepy, 03 is Grumpy, 04 is Bashful, 05 is Sneezy, 06 is Happy (07, presumably Dopey, hasn't yet appeared on screen). (0-8-4
  • Leo's real name is revealed to be Leopold in Seeds


Leo Fitz's gallery can be found here.



Start a Discussion Discussions about Leopold "Leo" Fitz

  • Skye x Fitz

    10 messages
    • I prefer Fitzsimmons, personally, just because they both understand each other. I think fitz might have had a crush on Skye, but showed his t...
    • I like the Skye/Fitz pairing solely because of the scene where they pretended to be a couple. Fitz's american accent was awesome.

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