Dialogue between this Mark and Mask Invincible suggests that Sinister Invincible^[1] killed his own mother in his childhood house in his dimension, which made him hate return to the place. The Firebreather of his dimension is known as the king of all monsters, and one of the most ferocious villains Sinister Invincible has ever faced. Sinister Invincible would eventually be approached by Angstrom Levy, who said he would help him expand his empire into countless dimensions if he took place in his master plan, the Invincible War. Sinister Invincible accepted, and led the charge into the mainstream dimension with fifteen other Evil Invincibles on the first day of the War (as seen in the Start Picture), and noted how evil they all were, but all the same person.

Sinister Invincible would go to Nevada on the first day and fight the mainstream Firebreather, who is not as strong or evil here. After defeating him easily, in the second day, Sinister Invincible would run into Oliver Grayson, fights him, and realizes that he is a lesser Viltrumite and cannot possibly defeat him. Sinister Invincible surprisingly lets Oliver live before leaving. He would lay waste to a major city by the third day, and meet up with the other seven surviving Evil Invincibles above his childhood home in the mainstream dimension. Sinister Invincible would admit that he still hated coming back to his childhood home in any dimension, to which Mask Invincible comments that not every one of them had killed their mother and that he likes seeing it for a change. Angstrom Levy arrives and tells them that the entire War was "phase one", and "phase two" would entail the remaining Evil Invincibles bring Invincible to Angstrom so that they could punish him. Instead, Sinister Invincible tells Angstrom off. He points out that there are only eight remaining Evil Invincibles left from the twenty that there were when this started. He also points out that the mainstream dimension is in shambles, and that they should move on to a new one or kill Angstrom. This results in him being banished to an alternate dimension by Angstrom without food or water, followed by the seven other Evil Invincibles. One of those seven was Mohawk Invincible. Sinister Invincible shouts that they cannot be contained, and he vows to find a way out of there and kill Angstrom.^[2]

The eight of them talked a lot while stranded, mostly about what turned them evil. Weeks passed, and the seven of them realized that the eighth one was a jerk, so because they were starving to death they all ate him. It's implied by Mohawk Invincible that Sinister Invincible was the one that suggested cannibalizing each other. Mohawk Invincible flew away, but the other six Evil Invincibles ate each other until only Sinister Invincible, Viltrumite Invincible, and Stripe Invincible remained. Then, Viltrumite Invincible and Sinister Invincible ate Stripe Invincible, and Sinister Invincible remembered how he would sometimes resort to cannibalism in his dimension and that he liked the taste of human flesh. Meanwhile, he has grown really long hair and a short beard. Sinister Invincible would go insane and find and attempt to eat Mohawk Invincible, but Mohawk Invincible escaped. Finally, Sinister Invincible turned on Viltrumite Invincible and killed him. While Sinister Invincible was eating him, Invincible would be banished into that alternate dimension as well.^[3] Invincible, confused, would approach Sinister Invincible eating Viltrumite Invincible next to five other skeletons.

Sinister Invincible would invite Invincible to eat Viltrumite Invincible with him, admitting that there is a lot of thigh left, he just started eating him because he recently killed him, and how thigh is the best part. Sinister Invincible says that he thought Viltrumite Invincible was the last one, in reality forgetting about Mohawk Invincible, but says how he forgot about Invincible, who he believed was one of the seven stranded with him. As Invincible realizes who Sinister Invincible is, Sinister Invincible says that he cannot believe that the Evil Invincibles thought that Sinister Invincible planned the cannibalism, because he did not believe that he would be the last one to survive. Sinister Invincible reveals how desperate and starving the Evil Invincibles where after a few weeks, and how the first one they ate was the worst of them all. Then, Sinister Invincible starts to question if Invincible is real or if they ate him already, but by grabbing him Sinister Invincible determines that Invincible is real and has been stranded only recently. Invincible punches Sinister Invincible away, who says how his hunger never goes away, but also that he is bored. He thanks Invincible for putting up a fight, and proclaims that the winner shall eat the loser and Viltrumite Invincible. Invincible tells him how he could help him get back to Sinister Invincible's home dimension, but he ignores the comment and says that the Evil Invincibles did not get weaker as they got more hungry, and that Invincible is weak from not being stranded for weeks. Invincible protests that he only wants to help, and Sinister Invinciblereveals that the only way he can help him is if he lets him eat him. Invincible then attempts to fly faster than him to get away, with Sinister Invincible in pursuit.

Eventually, Sinister Invincible grabs Invincible and throws him to the ground. Sinister Invincible starts to tell him how what he had to do in order to survive has made himself the stronger one, when Mohawk Invincible arrives and slams Sinister Invincible away. Mohawk Invincible and Invincible fly away and talk, but soon Sinister Invincible finds them. Without even noticing Mohawk Invincible, Sinister Invincible grabs onto Invincible, who knocks him away and tells him how he now has a partner. At that moment, Mohawk Invincible flies with Sinister Invincible into the ground and pummels him repeatedly. Mohawk Invincible shouts how they could have found a way out of the alternate dimension together, but Sinister Invincible turned them against each other and was the worst of them. Mohawk Invincible then beats Sinister Invincible to death. Invincible tried to stop Mohawk Invincible but it was too late, and then Angstrom Levy opened up a portal back to the mainstream dimension.

• Human/Viltrumite Physiology: Sinister Invincible is an inter-dimensional duplicate of Mark Grayson. He has the same powers as Mark.

• Superhuman Strength: Sinister Invincible possessed vast superhuman strength and during the Invincible War he defeated Firebreather and Kid Omni-Man.^[2]
• Superhuman Speed
• Superhuman Stamina
• Superhuman Endurance
• Flight: Sinister Invincible could fly at high speed.^[2]
• Interstellar Travel
• Enhanced Lung Capacity
• Invulnerability: Sinister Invincible was completely unhurt by Firebreather's flames.^[2]
• Enhanced Healing Factor
• Decelerated Aging
• Dominant Genetics

• Vulnerable Ears: In order to achieve flight, a Viltrumite's equilibrium must be balanced. This system is located in their ears and thus anything that disrupts their inner ear function can disrupt their flight. This does not include loud sounds, but much rather certain pitch pulses. It can cause their ears to bleed and possibly kill them if down for too long.^[4]

• His uniform