Rocket voice actor Bradley Cooper kept things casual in a sweater and sneakers.
Chukwudi Iwuji plays the bad guy, the High Evolutionary, in the sequel — and he wore a sharp green suit for the premiere.
Will Poulter looked equally suave in a Yves Saint Laurent suit.
Kraglin star Sean Gunn also brought his wife, actor Natasha Halevi, to the premiere.
Brothers Sean and James Gunn also snapped a photo together.
Marvel newcomer Daniela Melchior also showed up in a vibrant pair of green boots.
Australian star Elizabeth Debicki reprises her role as High Priestess Ayesha in "Vol. 3," and she brought an ethereal look to the carpet.
"Guardians of the Galaxy" alumni Michael Rooker showed up to support his friends and rocked a casual flowery shirt.
Marvel fans might know Linda Cardellini as Linda Barton in "Avengers" and "Hawkeye," but she voices Lylla the Otter in "Guardians of the Galaxy Vol. 3," and she brought her daughter to the premiere.
Actor Rob Lowe also attended the premiere with his son, Matthew Edward Lowe.
The whole cast later took to the stage to introduce the film.
Nvidia's quarterly results blew away estimates again on Wednesday, and as the company moves to its next-generation chips its CEO sees supply, not demand, serving as its biggest challenge.
Marvin Harrison Jr., Fanatics said, “rejected or ignored every request” from the company while refusing to fulfill obligations of their contract that was signed last May.