A Starfleet Admiral in the Kelvin timeline, Marcus was a very aggressive character who felt that war with the Klingon Empire was inevitable. To that end he sought to militarise Starfleet to the maximum possible extent, overseeing weapons developments for the coming war. [1]When the bodies of Khan Noonien Singh and his followers were discovered aboard a ship in cold sleep, Marcus revived Khan and recruited him into Section 31 where he asked him to develop new weapons and warships for Starfleet. Khan complied, helping Marcus to create the Dreadnought class USS Vengeance, a large, extremely fast and very powerfully armed warship. Khan attempted to smuggle his followers to freedom but the plan was subverted by Marcus. Khan responded in kind, staging terrorists incidents on Earth. Admiral Marcus sent Captain Kirk to kill Khan in an attempt to cover up his actions. When Kirk instead captured Khan Marcus came in the USS Vengeance and attempted to destroy the Enterprise. His daughter, Doctor Carol Marcus, attempted to use her presence on the ship to prevent the attack but was unsuccessful. [1]Admiral Marcus was ultimately murdered by Khan on the bridge of the Vengeance. [1]