Thanos is a fictional character that appears in comic books and other media published by Marvel Comics. The character first appeared in Iron Man #55 (Feb. 1973) and was created by writer-artist Jim Starlin.

Debuting in the Bronze Age of comic books, the character has featured in over three decades of Marvel continuity and a self-titled series. The character's name is a derivation of Thanatos, the personification of death and mortality in Greek mythology.[citation needed] One of his most prominent storylines to date - the Infinity Gauntlet series - portrayed him as a mad cosmic tyrant bent on slaying half of all sentiences existing then in Marvel's multiverse in order to appease the Marvel Universe's actual (and more powerful) embodied personification of Death in an attempt to win her love.

Thanos has consistently recurred as a powerful villain, and has been featured across nearly Marvel's entire product line, including animated television series; arcade and video games; toys and trading cards.

From Wikipedia

This particular doll is a slight improvement on an already existing version.