Mark Grayson

Markus Sebastian Grayson is a Viltrumite-Human hybrid born on the planet Earth. He is the son of Author Nolan Grayson, otherwise known as Omni-Man and his wife Debbie Grayson. He is also known as the superhero known as Invincible.

Origins
Mark was born to a Viltrumite male named Nolan Grayson, who worked as an author, but also was known as Omni-Man. His mother was a human female named Deborah Grayson. When he was 7 years old, his father told him that he was indeed an alien sent to defend Earth and that he was Omni-Man. This wasn't his only news, as he even said to Mark that one day, he will inherit powers just like him, even the ability of flight. Every day since, he waited for his abilities to develop. It wouldn't be until his senior year at the Reginald Vel Johnson Highschool, during his afterschool hour part time job at a local Burger Mart, that he sent a trash bag flying into the sky. Seeing this, all Mark could utter was "It's about time".

Following this, he told his parents about his powers and Nolan took him to his good friend Art Rosebaum to create his super suit. He didn't have a name for himself yet, but it wouldn't be long before he found a name which suited him, Invincible.

Invincibility
Two months following the manifestation of his abilities, Mark met with a group of superheroes known as the Teen Team, which consisted of Robot, Rex Splode, Dupli-Kate and Atom Eve, the latter of the group who was also a student at the same school Mark tended. He would also aid his father in battling a group of aliens known as Flaxans, then became friends with Atom Eve and battling their teacher David Hiles, who was killing students by strapping explosives to and detonating them. Mark would have his first encounter with Allen the Alien, who he initially fought while his father was away. It was revealed however that Allen was on his way to the wrong planet for 15 years and his job was to test the champions of a planet, only to leave on good terms with Mark.

A few days following this incident, Mark tended an open house with his best friend William Clockwell at Upstate University. It was here that the campus was under attack by the Reanimen, leading to Mark to change into his uniform and face the threat. Successfully neutralizing the Reaniman, William would eventually deduce Mark's identity, as well as his friend having superpowers and promising to keep his secret. Following this, Mark was visited by Atom Eve, who was upset due to her boyfriend Rex Splode having an affair with Dupli-Kate, leading to Mark comforting her. His mother found them in his room and told them to come down, where she lectures the two, believing them in a relationship. Mark's father returns, telling them that the Guardians of the Globe have been killed. The next day, Will discuss Mark's secret identity with him, while he also gets an envelope from Amber Bennett and Eve goes to speak with Mark, while not trying to reveal their identities to each other.

Mark tends the funeral with his father for the Guardians, but the service is interrupted by Black Samson's vengeful butler, Sanford. Mark moves Art Rosebaum away from the area while his father deals with Sanford. Sometime later, Mark opens the envelope that Amber gave him, revealing her phone number.

Powers

 *  Viltrumite-Human Physiology:  Being born of 2 different species, Mark possesses the same physical abilities gifted to him through his alien heritage.
 * Invulnerability: Mark's skin is far harder than a human's, making him virtually impervious to physical attacks. Despite this durability however, Mark's body can be pierced by those with equal or superior strength.
 * Superhuman Strength: Mark is strong beyond that of normal human levels. This allows him to lift things such as massive warships, cruise ships, falling buildings and other heavy objects with relative ease. So long as he pushes his strength beyond their limits, Mark himself will become stronger.
 * Superhuman Speed: Mark is capable of moving at speeds rivaling the most advanced aircraft, capable of moving from the United States to Antarctica within a few seconds and velocities to ascend into orbit with a few minutes. Much like his strength, Mark usually needs to push his speed levels passed their limits to achieve even faster speeds.
 * Superhuman Stamina: Mark's stamina is beyond that of a typical human. So long as he pushes himself, he can stay in a fight for hours without tiring. This was shown during is inevitable confrontation with his father.
 * Superhuman Endurance: Mark is capable of holding his ground in a fight, regardless of taking blows that would otherwise badly injure or kill a human. He's capable of fighting while disemboweled, having broken limbs and take hits from a Viltrumite like Thragg, as well as being charred by being in close proximity to Earth's sun.
 * Enhanced Lung Capacity: Mark's lungs allow him to hold his breath for long periods of time. This enables him to hold his breath in space for a good 2 weeks.
 * Enhanced Healing Factor: Mark possesses a healing factor, which gives him immunity to virtually every known ailments, imperfections and disorders. This also enables him to heal any kind of injuries he sustained in combat with other enemies, but it depends on the severity of the injury sustained during battle.
 * Interstellar Travel: Like normal Viltrumites, Mark is capable of moving comfortably in space without the need of a starship.
 * Flight: Mark's inner ears possess a complex balancing capability, which enables him to defy the laws of gravity without issue.
 * Decelerated Aging: Mark has the potential to live for thousands of years, despite his hybrid physiology. As he gets older, his aging process gets slower and he could be so much more older chronologically and remain rather young in appearance.
 * Dominant Genetics: Much like other Viltrumites, hybrids like Mark possess the ability to have offspring with other species and his children will then inherit his capabilities, as well as overriding most of the genes his spouse possesses.

Weaknesses

 * Vulnerable Ears: Like other Viltrumites, Mark and other hybrids possess an equilibrium in their inner ears, allowing them to fly. If this is disrupted however, Mark is incapable of flight and is in a state of agony. Though this doesn't necessarily have to be from loud noises, but certain frequencies, which can not only cause their ears to bleed, but possibly kill them as a result.