Alphonso "Mack" Mackenzie is the Director of S.H.I.E.L.D. Despite the heavy casualties S.H.I.E.L.D. took during HYDRA's attack on it, he stayed loyal to his oath and continued his service in the remains of S.H.I.E.L.D. under Robert Gonzales. However, as another faction of S.H.I.E.L.D. led by Phil Coulson emerged, he was sent alongside Bobbi Morse and Isabelle Hartley to infiltrate it. Now working undercover, he pretended to be a simple mechanic while searching for Nick Fury's Toolbox. When the truth was revealed, Mackenzie's colleagues quickly attacked and occupied the Playground, taking control over most of S.H.I.E.L.D. However, the two factions eventually managed to put aside their differences and work together against HYDRA. When S.H.I.E.L.D. was formally reunited with Coulson as its rightful director, Mackenzie decided to leave the organization, only to change his mind when the Inhumans killed Gonzales and attacked S.H.I.E.L.D. After the War against the Inhumans, during which he saved Coulson's life, Mackenzie was put in charge of overseeing all alien artifacts S.H.I.E.L.D. may collect.