Randall Flagg is the main villain of the Stephen King book and 1994 TV Miniseries, The Stand. He was played by Jamey Sheridan.
He notices Lloyd Henreid, Flagg's sidekick and badguy, getting beat up and arrested in the beggining of the TV Miniseries and sees that Henreid can be useful to him. Then he walks down an empty road and kills an animal and then the Monster Shouter. There are warnings to the heroes of The Dark Man/Randall Flagg. He later summons Trashcan Man, criminal and villain, to him and taunts Mother Abagail, main heroine and leader of the good survivors of the Superflu.
Flagg manipulates and decieves Nadine Cross, his lover and vilainess, to leave Larry Underwood, hero and singer, and later lie and trick Harold Lauder, villain and nerd, into doing Flagg's bidding, which is to set in motion an attack on the good survivors. Lauder later is betrayed when Randall appears to him on his and Cross's way to Las Vegas and causes him to have an accident, which badly injures him, and Flagg says to Cross to leave him and continue to him. Flagg kills a henchman of his for failing him of killing the judge and then becomes the reason of Dayna's, heroine andrighteous follower, death.
He executes followers, who disappoint him even those who drink and do drugs die and makes Henreid his second in command and gets Trashcan Man to find and put together explosives and bombs. He turns on Nadine by raping her and hoping that she will bring the birth of his child. But she kills herself by dropping from his Plaza castle. He then plans to execute the heroes, Larry Underwood and Ralph Brentner by disemberment, and ordered Henreid to destroy Glen Bateman, hero and teacher, and Whitney Horgan, bad follower and cook, tries to stop this and yet he is killed by Flagg's black magic.
Then Trashcanman arrives and brings the A bomb and then the hand of God appears with Mother Abagail's angelic voice, which detonates the bomb, that wipes out Las Vegas and brings the heroes home. In the book, he survives but in the TV Miniseries, Flagg tries to escape but is killed by the explosion.