The Titans were a race of beings from the planet Titan. At some point in the past, their planet was crippled by overpopulation, eventually causing a societal cataclysm that rendered the species functionally extinct, leaving Thanos as the only survivor. The species became extinct when Thanos was ambushed in 2018 and was beheaded by Thor without producing any biological children. An alternate version of Thanos was later killed in 2023 when Iron Man used the Infinity Gauntlet to kill him and his forces.
Due to overpopulation, the planet began to run out of resources. Thanos offered a solution, to randomly kill off half of the planet's inhabitants so that the other half could truly live without having to fight each other. The Titans saw his solution to be madness and refused to let Thanos intervene. This led to Titan eventually being devastated when the people finally snapped and turned on each other for survival, and left mostly uninhabitable. The Titans themselves went nearly extinct after the conflict.
Thanos began to believe that other planets would suffer the same fate, causing him to become obsessed with "saving" the universe, by killing half of each planet's inhabitants.
When Thor killed Thanos in the Ambush on Thanos, the Titan race went extinct. The species was briefly resurrected when a version of Thanos from an alternate 2014 travelled to 2023 before he too was killed, wiping out the species once and for all.
Titans are much larger than humans, and their physical constitution is strong enough to wield the Infinity Stones without strain (with the exception of the Power Stone) and easily overpower and severely injure beings as strong as Vision, Hulk, and Thor, as displayed by Thanos. Titans, despite their large size, possess incredible superhuman speed and reflexes that allows them to easily outmaneuver and overwhelm not only other beings of similar sizes, such as Hulk but also even smaller and highly agile individuals as well, such as Loki, Drax the Destroyer, Gamora, and Iron Man in his Mark L Armor. They are also able to react swiftly to high-speed projectiles.
They are invulnerable to many forms of damage, as even Gamora has stated that killing Thanos may not be possible, and the only known weapon with the power to kill Thanos was Stormbreaker, the most powerful weapon forged from Uru, and only if the axe was powered to the maximum and the attack was lethal.
As Thanos was viewed a deviant member of his species however, it is unclear what a normal Titan looks like, and what physical traits, if any, they share with Thanos or how far removed Thanos was from the norm of his species.
- In the comics, the Titanians were an offshoot of the Eternals that inhabited the Saturn moon of Titan. They were mostly exterminated at the hands of Thanos.