SAN DIEGO — Dust off your Captain Marvel cosplay, San Diego Comic-Con is here.

The four-and-a-half day convention kicks off Wednesday when the show room floor opens to thousands vying for exclusive merchandise, from art to toys. Later, Warner Bros. will get things going with an event promising new footage from “It: Chapter Two.”

“We have some exciting footage but I can’t go into details,” said “It” director Andy Muschietti. “But I think it’s going to be worth it for the fans to go and watch.”

Movie fans will also get a look at Paramount’s “Terminator: Dark Fate” at a presentation Thursday, and on Saturday be treated to a Marvel Studios presentation with its president, Kevin Feige. Details for the Marvel show are being kept under wraps, but many expect Feige and his “special guests” will outline the plans for Phase 4 of the Marvel Cinematic Universe, which could include announcements about “Black Widow,” “Guardians of the Galaxy Vol. 3,” ‘’Shang-Chi” and “The Eternals.”