Short answer: In the story, It preys on children, and fear is part of how it terrorizes and feeds on them. Welcome to Derry adds a show-specific reason for the clown form. It kills a traveling performer named Bob Gray, notices how his act captivates children, and takes his stage identity as a lure. That explains why It keeps using the clown. It does not settle what It is or what ultimately drives it.
This article contains spoilers for the Bob Gray reveal and the first season of Welcome to Derry.
Where the question comes from: Stephen King’s novel
In Stephen King’s It, the creature is a shape-shifter that takes many forms, and Pennywise is the clown it most often wears when it hunts children in Derry. The novel also uses the name “Bob Gray,” which It or Pennywise sometimes gives. The book, however, does not explain a specific human origin for that identity. The clown’s connection to a real person is left as a loose thread.
That gap is what the prequel set out to fill. In a Television Academy interview published October 28, 2025, executive producers Andy and Barbara Muschietti said they were drawn to that unfinished puzzle and wanted to explore Bob Gray’s origins in Welcome to Derry.
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What Welcome to Derry adds
Reporting on the episode “The Black Spot” describes the show’s new backstory. Bob Gray was a traveling clown whose act delighted children. It noticed how effectively that persona captivated them, killed Gray, and adopted his stage identity. Syfy Wire’s December 8, 2025 coverage of episode seven places this reveal at the center of the season’s mythology.
Bob Gray: the performer It replaces
The show gives the clown a human past that the novel never supplied. Gray is not an invention of the monster’s appearance; he is a working entertainer whose audience reaction becomes the template It later reuses. That reframes the question. The clown is not simply a costume It likes. It is an identity that was already proven to draw children close.
Why a clown works as a lure
In the series’ logic, the clown is both disguise and invitation. A familiar entertainer can approach children without alarming them, and the performance itself does the work of lowering their guard. Jason Fuchs, co-showrunner, put the appeal bluntly in the episode-seven behind-the-scenes material reported by Syfy Wire: “For a creature whose whole thing is eating kids, that’s a pretty attractive proposition.”
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This is the most direct answer the show offers to “why Pennywise?” It is a strategic answer about attraction, not a full account of the creature’s nature.
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Fear, feeding and the “seasoning” remark
The show treats fear as both personal and historical. In a TV Insider premiere interview published October 26, 2025, the creators described the 1962 setting, in which It exploits period anxieties such as nuclear attack and radiation, while its manifestations connect with each character’s particular fears.
Andy Muschietti’s finale interview, published by TV Insider in December 2025, describes Pennywise’s grotesque showmanship as a way of “seasoning” the children. Treat this as a description of the show’s staging rather than a biological rulebook. It explains the performance; it does not define how It digests fear or what it needs in a literal sense.
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The safest reading is therefore this: It terrorizes and feeds on children, fear is part of that process, and the show’s added Bob Gray material explains why the clown is an effective way in.
A storytelling choice versus an in-world motive
Two different explanations are easy to blur. The first is the in-world motive: It hunts children, and the clown helps it get close. The second is the production choice behind the show’s opening. In a TV Guide interview published October 27, 2025, Barbara Muschietti explained the pilot’s deadly turn this way: “sets the tone, so we don’t forget for a second how unpredictable IT is.”
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The deaths in the premiere therefore serve the creators’ goal of establishing danger and unpredictability. They are not evidence that the show has worked out a complete theory of why It kills.
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How the novel and the series compare
| Question | Stephen King’s novel | Welcome to Derry, season one |
|---|---|---|
| Origin of Bob Gray | Name used by It or Pennywise; no specific human origin explained | A traveling clown whose act delighted children, killed by It, whose identity It adopts |
| Why It uses the clown form | Not explained as a human-derived identity | The persona captivates children and works as a lure |
| Stated reason It targets children | It preys on children; fear is part of its predation | Same core predation, with the clown as a strategic tool |
| What It is and ultimately wants | Left deliberately open | Described by the creators as still unresolved |
What remains open
In a Los Angeles Times interview published October 31, 2025, Andy Muschietti described the novel’s ultimate questions about what It is and wants as intentionally unresolved. The finale interview from December 2025 treats non-linear time the same way: as a question the show poses rather than a settled rule.
The show also does not provide a quantified motive. No published statistic explains why It targets children; this is fictional lore, and the creators’ remarks do not turn it into measurable behavior. Readers looking for a definitive, rules-based explanation of the creature’s hunger will not find one in the series. What they will find is a clearer origin for the clown and a sharper account of why it works on children.
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