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'''Dr. Samuel Hayden''' is a character in the {{timeline|2016}} [[Doom (2016)|Doom]], a high-ranking [[UAC]] official who formerly oversaw the [[Argent energy]] research projects at the [[Argent facility]] on [[Mars]]. After an unknown incident during construction of the facility's [[Argent Tower]]which caused him to develop cancer, he was forced to replace almost the entirety of his body with cybernetics. He was first officially shown by [[id Software]] in the game's official launch trailer{{cite web|author=[[Bethesda Softworks]]|title=DOOM — Launch Trailer|url=https://www.youtube.com/watch?v=RO90omga8D4|publication=YouTube|publishdate=5 May 2016|accessdate=11 May 2016}} greeting the [[Doom's protagonist|Doom marine]] after he awakens from an apparent slumber. In exclusive footage released by video card manufacturer {{wp|NVIDIA}} to demonstrate the performance potentials of the then-new {{wp|Vulkan (API)|Vulkan}} graphics API in [[id Tech 6]], he can be heard acting as an advisor to the marine, speaking about [[Olivia Pierce]], to whom he is now an enemy. He states that he had hoped she would "rise above their influence," referring to the demons from [[Hell]] which she instead unleashed.{{cite web|author=NVIDIA|title=Exclusive DOOM 1080p 60FPS Gameplay with Vulkan API on GeForce GTX|url=https://www.youtube.com/watch?v=anrvBD4aTGY|publication=YouTube|publishdate=11 May 2016|accessdate=11 May 2016}}

Hayden is adamant in defending his original research projects into [[Hell]] and its [[Argent energy]] reserves, stating that it was all in mankind's best interest, and that the sacrifices made would have been worth the cost, if his other staff had been able to resist the corrupting influences of the demonic dimension. While he seems friendly, whether or not he can be trusted must be regarded as a question.

Hayden meets initial resistance from the protagonist Doom marine when trying to recruit him to fight against Olivia and stop her planned opening of the invasion portal to Hell in his preferred manner, with the soldier violently destroying every device he tries to use for communication. Dr. Hayden ends up forcing the marine's hand by cutting off his access to the satellite communications array and offering him the information he seeks in exchange for his cooperation. Once actively allied, Hayden has [[VEGA]] give the marine access to all of the facility's Argent energy capsules. ==Character origins==The original plans for [[Doom 3]] called for a character named [[General Hayden]] to function as a secondary villain, initially appearing to be the cause of the invasion and taking the place of [[Dr. Malcolm Betruger]] in several of the game's scenes, only for Betruger to be later revealed as the true mastermind. While dropped from the game, with his roles dispersed between those of Betruger and [[Sergeant Kelly]], he was retained and revived in the [[Doom 3 novels]].