I remember watching it on netflix but I'm not sure if its there anymore
The show partially took place in space and very far in the future. If memory serves right the show looked western animated in the way that invincible does with clear anime influences. It also didnt shy away from gritty gore also like invincble. I think the main character was the captain of some sort of crew in space.There were two key scenes i remember one where the main character (in a flashback?) is a scientist that triggers an accident wiping out a massive amount of people( city, planet, all of hmanity, im not sure) im pretty sure this also made him superhuman. The second is one scene where the main character and antagonist are on some destroyed world/city (maybe earth) and are fighting. In the scene there holding hands against eachother in a deadloick and the antagonist says something along the lines of "were both titans now" emphasis on the titans part.
I have a bad memory and this was years ago so please forgive my lack of thorough details at least once or twice a year i get an itch to hunt down the show and could just never find it. I tried with ai and reddit and ancient forums and still havent found it.