If you think the Mad Titan of the MCU looks menacing, you haven't been subjected to much of Thanos in Marvel comics. Some unspeakable atrocities have been committed against Thanos himself, but the worst things Thanos has ever done makes those incidents look like tickle fights.

Marvel's Ultimate Universe has depicted all kinds of unsettling things, but the most disturbing Thanos moments in Marvel comics don't even depend on that alternate, gruesome reality (and that's not even considering his evil henchmen, the Black Order).

You might also like this list of the best Thanos story arcs in comics.