Random Most Disturbing Thanos Moments In Marvel Comics (11 items)

(#7) Thanos Slays Gamora After Raising Her

It's already messed up Thanos took a baby Gamora and raised her to be his personal assassin; murdering said adopted daughter is just overkill. Yet that's precisely what the Mad Titan does in Infinity Watch. When her love Adam Warlock sets out to stop Thanos from acquiring the Soul Gems, Gamora accompanies him, ultimately facing off against her adoptive father. He slaps her down and later erases her from existence after completing the Infinity Gauntlet.
(#2) Thanos Smashes Sam Wilson's Head In His Hands

In case you were wondering, the sound a head makes when it is squished between two massive hands is "SPLORT." At least, that's how it's depicted in Thanos #10 when the Mad Titan kills Falcon-turned-Captain America, Sam Wilson.
(#10) Thanos Ends War Machine And She-Hulk

During a big brawl between Thanos and some Avengers in Civil War II, War Machine inadvertently hits She-Hulk with his missiles. While she's down, Thanos takes advantage, blasting her with his cosmic hands. He then moves on to War Machine himself, punching right through Rhodey's armor and stomach. She-Hulk succumbs to her injuries later.
(#3) Thanos Makes Hulk His Leashed Dog

The Thanos comic that began in 2016 goes to some pretty wild places, including a distant future in which Thanos is king of the universe after defeating the Avengers. Most of those Avengers are dead, but not Bruce Banner. He gets the dubious honor or being turned into the Mad Titan's madder hound.
Thanos keeps Hulk in a pit of bones, when he's not on-leash. Among the bones are those of Steve Rogers, the former Captain America who was fed to the Hulk Hound.
(#8) Thanos Turns Deadpool Into A Puddle

Not even Deadpool can survive what the Mad Titan does to him.

In Deadpool Vs. Thanos, the latter utterly crushes the former. Literally.
(#6) Thanos Punches Through His Father

Thanos is dying from a disease, so he seeks out his estranged father in the hopes of finding a cure. Knowing his son is a monster, however, the Mentor has no desire to help Thanos.

After some horrifying coercion, the Mentor tries to seek a cure but fails. In return, Thanos punches clean through his father.