When it comes to Stephen King's most terrifying creations, Randall Flagg often gets overshadowed by the likes of Pennywise from IT or the chillingly human Annie Wilkes from Misery. Those characters have been immortalized by unforgettable performances—Tim Curry and Bill Skarsgård both brought their own menace to Pennywise, while Kathy Bates delivered an all-time great turn as Annie. Flagg, on the other hand, has been played on screen by Jamey Sheridan, Matthew McConaughey, and Alexander Skarsgård, but none of those adaptations truly captured his literary power.

On the page, though, Flagg is a force to be reckoned with. He's a shape-shifting, name-changing entity who weaves through King's multiverse, appearing in nine novels—more than any other villain. While some appearances are brief cameos, others are central to the plot. Here's how those nine books stack up, from the least essential to the absolute best.

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9. The Dark Tower: The Wind Through the Keyhole (2012)

This interquel, set between books four and five of the Dark Tower series, is more about storytelling than action. Roland tells a tale to his ka-tet, and within that tale, there's another story. Flagg appears as Marten Broadcloak, one of his many aliases, but his role is minimal. It's a fascinating narrative experiment, but for Flagg fans, it's a letdown.

8. The Dark Tower VI: Song of Susannah (2004)

The weakest of the main Dark Tower books, Song of Susannah is heavy on setup and light on payoff. Flagg shows up in a flashback that explains the origins of Mordred Deschain, a character who becomes crucial in the finale. It's an important piece of the puzzle, but not the most exciting read.

7. The Dark Tower: The Gunslinger (1982)

The book that started it all. The Gunslinger introduces us to Roland Deschain and his pursuit of the man in black, who is Flagg under another alias. The novel's famous opening line—"The man in black fled across the desert, and the gunslinger followed"—sets the stage for an epic journey. Flagg's role here is significant, even if he's more of a mysterious presence than a fully fleshed-out villain.

6. The Dark Tower III: The Waste Lands (1991)

After skipping The Drawing of the Three (where Flagg is only mentioned), he returns in The Waste Lands as Richard Fannin. He allies with an enemy of Roland's ka-tet, setting up events for the next book. It's a solid entry in the series, and Flagg's reappearance is a welcome one.

5. The Dark Tower IV: Wizard and Glass (1997)

This book is a fan favorite, diving deep into Roland's past and his tragic love story with Susan Delgado. Flagg's role is more prominent here, as he manipulates events from the shadows. The final chapters, which tie back to the events of The Waste Lands, are particularly gripping.

4. The Eyes of the Dragon (1987)

Set in a medieval fantasy world, this novel features Flagg as a sinister advisor to the king. He's the mastermind behind a plot to frame the rightful heir for murder. It's a departure from King's usual horror, but Flagg is at his most cunning and calculating here.

3. The Dark Tower VII: The Dark Tower (2004)

The epic conclusion to the Dark Tower saga. Flagg, now going by Walter O'Dim, plays a key role in the final confrontation. His interactions with Mordred are chilling, and his ultimate fate is both surprising and satisfying. It's a fitting end for one of King's greatest villains.

2. The Dark Tower II: The Drawing of the Three (1987)

While Flagg doesn't appear in this book, it's essential to his story. The novel focuses on Roland's quest to draw three companions from different worlds, setting the stage for the battles to come. Flagg's absence is felt, but his influence looms large.

1. The Stand (1978)

The ultimate Randall Flagg novel. In this post-apocalyptic epic, Flagg is the embodiment of evil, leading a dark army against the forces of good. His transformation from a mysterious drifter to a full-blown demonic figure is one of King's greatest achievements. The book's climax, where Flagg faces off against the heroes, is unforgettable. It's no wonder this is considered one of King's best works.

Whether you're a die-hard Dark Tower fan or just getting into King's multiverse, these novels showcase Flagg at his best. For more on King's world-building, check out our list of sci-fi's best-built worlds. And if you're in the mood for more horror, our ranking of the most brutal NC-17 films might be up your alley.