Allen the Alien

Allen the Alien is an agent of the Coalition of Planets, which safeguards planets from threats. He first meets Mark Grayson / Invincible after Mark has been a hero for some time, not immediately after his powers manifest. Allen is beaten nearly to death by three Viltrumites, but he grows stronger upon healing due to a Unopan breeding program designed to create a specimen strong enough to defeat a Viltrumite. Later, Allen comes to Earth to recruit Mark and Nolan to the Coalition, but Mark reveals Nolan's incarceration.

Mark gifts Allen Nolan's books, which are simply Nolan's personal journals and research, not secret hints about the Viltrumite empire. Equipped with these, Allen thanks Mark and leaves to find Nolan. Allen runs into the Viltrumite Anissa and allows himself to be captured specifically to find Nolan. Allen convinces Nolan to join the Coalition, and the two escape from prison.

They kill the two Viltrumite guards, while Battle Beast—imprisoned on the same ship—kills the guards and security forces. Battle Beast disappears in the chaos, and Nolan reveals to Allen that there are fewer than fifty pure-blooded Viltrumites left. Allen takes Nolan to the Coalition homeworld, Talescria, and introduces him to Thaedus. Thaedus tasks the two of them with finding weapons to aid in their fight against the empire.

Allen and Tech Jacket are able to return to Talescria in secret and spend months helping the Coalition fight the Viltrumites. Before the Viltrumite War ends, Allen reveals to Nolan that a new strand of the Scourge Virus has the potential to kill the Viltrumites hiding on Earth, but also the potential to kill every human on Earth. Nolan disagrees with Allen, as he believes that Earth can change the views of the Viltrumites as it did for him.