<P> Glenn Talbot (portrayed by Adrian Pasdar) is a United States Air Force colonel and later brigadier general who hunts active S.H.I.E.L.D. agents after the organization's disbandment . Coulson earns his trust over time, and the two soon enter an agreement in which S.H.I.E.L.D. provides the government with sensitive assets and helps with the take down of Hydra in exchange for being left alone . He is made head of the Advanced Threat Containment Unit (ATCU) following the death of Rosalind Price, an arrangement which sees him reluctantly working for Coulson . Glenn Talbot is later placed in a coma following a head shot caused by the Daisy Johnson LMD at a government meeting . Talbot was later revealed to be a prisoner of General Hale until Coulson managed to free him . However, upon calling his wife Carla, Hale's subordinate Candice Lee forces her to read a script to activate his brainwashing that occurred during his imprisonment . Talbot eventually enters the Rebirth machine to absorb gravitonium, becoming Graviton . He finds Robin Hinton so she can tell him where the gravitonium within the Earth is located . During his fight with Johnson, Talbot is blasted into space after Johnson takes the Centipede Serum where his body becomes frozen in ice . </P> <P> Created by Stan Lee and Steve Ditko for Tales to Astonish #61, Talbot was a recurring antagonist of the Hulk . Pasdar was cast as Talbot by March 2014, with this version focused on taking down Hydra . In the fifth season, Talbot becomes the villain Graviton, despite the series previously introducing Franklin Hall in the first season, the character who becomes the villain in the comics . </P> <P> Eric, Billy, Sam, and Thurston Koenig (all portrayed by Patton Oswalt) are identical brothers . The former three are S.H.I.E.L.D. agents, programmers in the initial S.H.I.E.L.D. LMD program . Eric is stationed at the Providence base and assists Coulson in the wake of Hydra's emergence, but is soon killed by Ward . Coulson and his team meet Billy, the brother of Eric, at the Playground base soon after . Billy and Sam work with Coulson on the mysterious Theta Protocol, the maintenance of a S.H.I.E.L.D. helicarrier for use by Nick Fury . Later, Coulson entrusts the Darkhold to Billy and Sam, who hide the book in the Labyrinth, a S.H.I.E.L.D. base only accessible by the Koenigs . Thurston is a slam poet activist who is not a S.H.I.E.L.D. agent and refers to them as a bunch of "sheep" due to the death of their brother Eric </P> <P> Oswalt joined the series as Eric Koenig in March 2014 . This version of the character is loosely inspired by one that first appeared in Sgt . Fury and his Howling Commandos #27 . Oswalt also portrays Eric's brothers . After previously working on Joss Whedon's Dollhouse and being a long time fan of Marvel, Oswalt was sought for the part specifically . </P>

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