Guardians of the Galaxy director James Gunn has brought attention to a character many may not know was co-created by Stan Lee on what would have been the comic book creator’s 97th birthday.

Gunn took to Twitter to show his admiration for Lee and revealed that while many are aware of his more popular creations, like Spider-Man and the Hulk, Lee was also one of the creators behind another character who has seen a massive surge in popularity since his big-screen debut in 2014’s Guardians of the Galaxy: Groot.

“Today, on what would have been my friend & hero #StanLee’s 97th birthday, I’d like to point out, in addition to Spider-Man & the Hulk & Thor, etc, he created the most popular Guardian of the Galaxy, Groot, which is rarely mentioned,” wrote Gunn. “Love and miss you, Stan.”

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