Frank Horrigan was born in The Enclave decided to send him to the Oil Rig for study. For two years, Horrigan was operated upon, and studied by the Enclave scientists while he gradually mutated into a super mutant, both physically and mentally. Charles Curling used him as a guinea pig for experiments with his modified strains of FEV, considering the result somewhat successful.
When tests began to run dry in January , the Enclave decided that it was time to redeploy him as a field operative. He was fitted with a custom-engineered set of power armor powered by a back-mounted supersized micro fusion reactor, [Non-game 7] and after a few successful field tests, he was assigned to his new role. The Enclave ensured his utter loyalty; they took advantage of his low intelligence, further damaged by the FEV, to reinforce his pre-existing loyalty to the presidency and the armed forces by running various conditioning programs on him, ordered under a presidential directive.
Exposure to FEV and subsequent experiments made him bigger, stronger and faster than any other super mutant. His armor continually injects him with drugs and other stablizing agents, and is the only thing keeping him alive. Horrigan was extensively deployed to the wasteland, tasked with resolving any situations that may affect the Enclave.
He indulged his sadistic streak, and the manner in which he killed "mutants" was brutal enough to give lasting nightmares to the Enclave troops supporting him. One such assassination occurred on August 30, , [11] he was tasked with hunting down and recruiting an elderly farmer whose knowledge could prove dangerous, killing him without a second thought when the man refused.
The Chosen One had the dubious privilege of witnessing the execution. Horrigan spared him and merely left, a costly mistake in hindsight. However, he met his match in the fall of , [Non-game 2] at the hands of the Chosen One. When they invaded Control Station Enclave and destroyed its computer, triggering a meltdown, Horrigan personally secured the exit to the PMV Valdez , to prevent them from leaving the oil rig. Damage to his systems was too extensive and he was bisected at the waist.
