He's consumed within that world, and he works very closely with Simmons, who's Biochem. They’ve got this kind of weird chemistry together, and they just kind of fit each other in a very weird way." Regarding the changing dynamic over time between Fitz and Simmons, De Caestecker said "I suppose what's happened from the start of season two up to midseason is, they've become a lot stronger as individuals, I think. But I think they still care for and need each other a lot, and they also work better together when they are together. But I think there's a lot of things that have still been unsaid and will hopefully come out, certain confrontations that are still bubbling under." Fitz also develops a close friendship with Alphonso "Mack" MacKenzie, beginning when the latter joins the cast in season two. Reviewing the season 1 episode "0-8-4", Eric Goldman of IGN criticized the lack of development for the majority of main characters, specifically Fitz and Simmons as he did with the pilot episode. However, he was more positive while reviewing "FZZT", praising it for finally giving the "well-needed" development of them both. De Caestecker was named TVLine's "Performer of the Week" for the week of September 27, 2015, for his performance in "Laws of Nature", particularly the episode's final scene. Fitz made his Marvel Comics debut in "S.H.I.E.L.D." (Vol. 3) #1 (February 2015) by Mark Waid and Carlos Pacheco. He joins Phil Coulson's team to regain the Uru Sword, an ancient weapon that belonged to Heimdall. He contacted the Vision in helping Heimdall overcome an alien rock that was possessing him. Fitz then delivered the rock to be analyzed by Jemma Simmons. His next assignment was protecting Wiccan from a man who had special bullets that could harm magic users. With Scarlet Witch's help, the team traveled to Antarctica to find the source and managed to defeat the people who were making the bullets. However, Dormammu took possession of Fitz and shot Scarlet Witch. After Dormammu was defeated, Fitz regained his senses. He became part of an elaborate plan by Coulson to retrieve the Quantum Drive from Hydra agents. Afterwards, Maria Hill began to suspect that there was a traitor in their midst and hired Elektra to sniff him out. Because Coulson was absent, Fitz could not be safeguarded by him and was forced to flee when Elektra accused him of being the traitor.