Phastos is a fictional character appearing in American comic books published by Marvel Comics. Created by Peter B. Gillis and Sal Buscema, the character first appeared in The Eternals (vol. 2) #1 (October 1985). He is a member of the Eternals, a human offshoot race in the Marvel Universe. Brian Tyree Henry portrays Phastos in the Marvel Cinematic Universe film Eternals (2021).