Phase Zero
Characters

Leo Fitz

Fitz-Simmons

Leopold James FitzMarvel TelevisionEarth-616

The engineer half of a pair who finish each other's sentences, and who spends seven years being taken apart and put back together.

Leopold James Fitz joins Coulson’s team as an engineering and weapons technology specialist and provides the technical support through the first season. He is close to Agent Simmons, having graduated from the S.H.I.E.L.D. academy with her. Iain De Caestecker plays him.

Minor spoiler

At the end of the first season Ward drops the two of them into the sea in a sealed pod. Fitz gives Simmons the only oxygen, confesses how he feels, and is left with a brain injury that the series does not undo. What follows is one of the very few long-term consequences in this entire catalogue that stays.

Played by
Iain De Caestecker
Role
Engineering and weapons specialist
Affiliation
S.H.I.E.L.D.
What they can do
None. He builds the things that get everyone out.

The journey

What happens to this person, title by title.

  1. Agents of S.H.I.E.L.D.2013

    Arrives as the clever one who talks too fast, and is changed permanently at the bottom of the ocean.

Appears in

  1. Agents of S.H.I.E.L.D.2013

Sources

Facts last checked on Sep 10, 2026