And the "girl" is actually the female embodiment of Death. See where this is going??
In the six-issue Marvel Comics' mini-series released throughout 1991, The Infinity Gauntlet chronicled Thanos' wielding of a mighty gauntlet affixed with the realty-bending Infinity Gems.
No, not "stones". Gems.
Proving his worth to Death, he used his complete mastery over reality to erase half the sentient life dwelling in the universe with a singular finger snap.