Emma Grace Frost is a character appearing in American comic books published by Marvel Comics. Created by writer Chris Claremont and artist/co-writer John Byrne, the character first appeared in The Uncanny X-Men #129 (January 1980). She belongs to a subspecies of humans called mutants who are born with superhuman abilities. Her mutation grants her high-level telepathic abilities and the power to turn into organic diamond. Emma Frost has evolved from a supervillain and foe of the X-Men to becoming a superhero and one of the team's most central members and leaders. The character has also been known as the White Queen and the Black King at various points in her history.
Emma Frost has been described as one of Marvel's most notable and powerful female heroes, being labeled as a femme fatale.
Since her original introduction in comics, Frost has been featured in various other Marvel-licensed products, including video games, animated television series, and merchandise such as trading cards. In particular, she has appeared in Generation X (portrayed by Finola Hughes), X-Men Origins: Wolverine (portrayed by Tahyna Tozzi), and X-Men: First Class (portrayed by January Jones).