When you've written as many books as Stephen King, chances that some of your characters and locations bleed into other stories is high. IT is one of King's most well-known novels, and it's influence has touched nearly every corner of the author's vast library of stories. With Derry being one of King's most haunting locations, and the Losers' Club and Pennywise the Clown being such memorable characters, it's no surprise they're brought up in a number of his books.
King created a vast, interwoven universe within his novels. These are some of the most memorable times IT, Derry, the Losers, or Pennywise are connected to another of his works.
Connection: The Tommyknockers (1987)
As soon as Tommy Jacklin enters Derry, he starts to hallucinate. When he turns onto Wentworth Street, he "thought he saw a clown grinning up at him from an open sewer manhole - a clown with shiny silver dollars for eyes and a clenched white glove filled with balloons." This marks the only time a character from a Stephen King novel outside of IT actually sees the infamous monster.see more on The Tommyknockers
Connection: Children of the Corn (1978)
After Mike Hanlon calls Ben Hanscomb in 1985 to tell him Pennywise has resurfaced and the Losers need to return to Derry to deal with it, Ben heads to his local watering hole - The Red Wheel. In the book, it's described that Ben's drive to the dive bar takes him through "a deserted little town" called Gatlin. Gatlin, NE, is the town where the children worship the corn and He Who Walks Behind The Rows in Children of the Corn.
Connection: Christine (1983)
After Henry Bowers saw what happened to his friends in the sewers below Derry in 1958, he lost control, and he eventually landed in Juniper Hill Asylum until 1985. When the Losers return to take on Pennywise again, the clown decides to bolster his own ranks and helps the old bully escape from the asylum. Once Henry gets outside the Juniper Hill walls he's met by his old - and very much deceased - friend Belch Huggins.
Belch tells Henry to get in his car so he can be dropped off in Derry. The car the deceased Belch is driving is a red and white 1958 Plymouth Fury - the same make, model, and color of Christine, the sentient car from the book of the same name.see more on Christine
Connection: Pet Sematary (1983)
Both IT and Pet Sematary feature pretty graphic child fatalities: Georgie Denbrough is torn to shreds by Pennywise at the beginning of IT, and Gage Creed gets hit by an Orinoco truck in the middle of Pet Sematary. The two boys end up being buried in Mount Hope Cemetery. The only difference is that Georgie stays buried while Gage is eventually dug up by his father Louis and reburied in the Pet Sematary - which leads to even more tragedy for the Creeds.see more on Pet Sematary