"There will never be another Stan Lee," the Captain America star shared on Twitter.
"For decades he provided both young and old with adventure, escape, comfort, confidence, inspiration, strength, friendship and joy. He exuded love and kindness and will leave an indelible mark on so, so, so many lives. Excelsior!!"
Deadpool actor, Ryan Reynolds took to Twitter with the following message:
"Damn... RIP Stan. Thanks for everything."
"RIP to one of the greatest creative minds of our time," Gad captioned the above picture on Twitter. "Thank you for such an incredible legacy and for giving us so many icons that will continue to live on long after you are gone. Goodbye #stanlee - we love you."
"Awww man, heartbreaking. R.I.P. to a true pioneer and legend," Aquaman director, James Wan said via Twitter.
"My youth wouldn’t have been the same without him. So grateful to have met the guy, and told him how thankful I was for his work. #stanlee"
"Overwhelmed with love and gratitude for the late, great hero, Stan Lee. Rest In Paradise," the Daredevil actress shared on Twitter. "Thank you for your imagination, creativity, tenacity, inspiration and love!"
"Permanent cameo in heaven," shared Oswalt alongside the following hashtag: