Is Allen Stronger Than Mark In Invincible Answered

Yes, Allen Has Become Stronger than Mark

Initially, when Allen the Alien was introduced to us, he was a decently strong character but was not stronger than Mark/Invincible. He was attacked by Viltrumites who left him gravely injured and for dead. However, when he recovered, he came back much stronger but the level of his strength was not revealed to us.
We only got to see how strong he is when by the end of season 2, he encountered the Viltrumites, and this time, their blows did not do much damage to Allen. However, when Allen hit back he made one of them bleed. In both seasons of Invincible, no one could make other Viltrumites bleed except Nolan. Since Allen did that, he is now stronger than Mark.
We are still to see if Omni-Man will team up with Allen to get out of Viltrumite captivity and in all honesty, it is bound to happen. So, let’s wait for Invincible Season 3 to come out and till then, stay tuned for further updates!