Image source-http://tinyurl.com/2p9t364v
Mark Grayson is the focus of the show Invincible, he posses Immense Strength, speed, and endurance. He is the son of Viltrumite Omni Man and human Debbie, throughout season 1 and 2 we’ve seen Invincible progress between that time. Fighting his Dad Omni man, fighting Alan the Alien and more. I will be explain how powerful he really is, by looking into his comic background.
Mark becomes the strongest Vltrumite, some say Thragg is some say it’s comparable, the reason for mark being this is because humans are genetically similar species making them a perfect compatibility to viltrumites, making Mark stronger than most.
At is weakest Mark can lift 400 tons, this means at his strongest or in a normal state of physical form, he can defiantly lift more. This could be 10 times more 100, or 1000, as Marks strength is stated to be unmeasured of course people have measured it and the results have always came out high.
What else has he done?
Invincible also killed a Viltrumite (Thaedus) thousands of years older than him with much more experience, this just shows how powerful he is, not to mention he did this as a beginner Viltrumite. So it’s safe to say that Mark is one of the most powerful Viltrumites, there isn’t a definite answer on who is stronger between Thragg and Mark (yet).
Mark has shown multiple times he can hold his own, if not kill any viltrumite.
Strength- He’s beaten Allan the alien, became stronger than his Farther, and beaten multiple villains some of witch are considered more powerful then him.
Speed-Flew Allan the Alien from above earth to the Moon in under 10 seconds, flew across an entire solor system if not galaxies in months, he’s also considered massively Ftl (around 10,957 times the speed of light). However this specific speed isn’t confirmed for mark being able to reach it.
Invincible Vs Alen the Alien clip- https://youtu.be/_mU_zaYk3lM?feature=shared
Durability- Other Viltrumites being basically turned into a splash of guts when fighting Thragg, Invincible wasn’t and he still manged to go toe to toe with Thragg in the Sun.