Roman (Zach McGowan) is head of security for an organization called “Codex”.
During the first few episodes, Angus MacGyver (Lucas Till) and Team Phoenix encounter an organization called “Codex”.
When trying to break out fellow Codex member “The Merchant” (James Callis) who’s being held at Phoenix in Episode 4×11 (Psy-Op + Cell + Merchant + Birds), Scarlett (Amber Skye Noyes) is arrested and interrogated by Phoenix.
To make it look like he defected and joined Codex, MacGyver helps Scarlett breaking out in Episode 4×12 (Loyalty + Family + Rogue + Hellfire). With the help of Riley Davis (Tristin Mays), they retrieve a weapon and bring it into Codex’ headquarters.
When head of Codex Leland (Tobin Bell) realizes in the Season 4 Finale (4×13: Save + The + Dam + World) that MacGyver is still loyal to Phoenix, he sends Roman to extinguish an entire group of Codex mercenaries. While Riley and Mac can escape, the others don’t. Codex member Gwendolyn Hayes (Jeri Ryan) is furious with Leland. She shoots Roman just as he is about to kill Mac and sacrifices herself to prevent Codex from detonating a nuke inside a dam. Leland and the rest of the surviving Codex members disappear.
In Episode 5×03 (Eclipse + USMC-1856707 + Step Potential + Chain Lock + Ma), Phoenix Boss Russ Taylor (Henry Ian Cusick) is kidnapped by Roman by orders of Leland; demanding a mercenary named Eric Andrews (Joe Pantoliano) in exchange for Russ. Off-camera, Leland gets Russ to reveal the location of a scepter with important information about Codex.
Reboot Series (recurring character)
4×12 Loyalty + Family + Rogue + Hellfire