- —Cullen Bloodstone[src]
On Cullen's tenth birthday, Ulysses took Cullen on a camping trip to the Black Realm of Klimtor. After teaching him some hunting and combat skills, Ulysses left Cullen to spend the night alone in Klimtor with a plan to return in the morning. Unfortunately, Ullysses was unexpectedly killed. Although Cullen remained in Klimtor for twenty-seven months, he only recalled the first six months. Believing Cullen to be at a boarding school, Elsa did not go in search of him. It wasn't until Elsa returned to Bloodstone Manor one night to restock on traps that she came across a possessed Cullen who quickly transformed into a rampaging monster. Luckily, Elsa was able to subdue him with the Bloodgem though not before leveling their home.
Because of his new condition, Elsa decided to enroll Cullen in the Braddock Academy. Elsa also gave Cullen a ring set with a Bloodgem to prevent him from transforming into his monstrous form again.
Upon arriving at the Academy he met and became close friends with Aiden. Eventually Cullen developed a secret crush on Aiden. Although brilliant, Cullen tried very hard to be unpopular and distance himself from others.
Originally, Cullen journeyed out with his classmates. During their journey to the Arcade's safe zone, Cullen was paired with Aiden and Nara when they were separated from the rest of their party.
Shortly after reaching the safe zone, their group was joined by X-23, Juston, and Death Locket. Together they learned the truth about Apex. When Apex escaped, Cullen was sent with the others by Nico to the beach where Hazmat and Reptil were residing.
After regrouping on the beach, the group decided to try to save Nico and stop Apex. Unfortunately, their group was whittled down until they were all dowsed with Trigger Scent and attacked by a berserker X-23. To save Aiden and the others, Cullen removed his Bloodgem Ring to transform into his monstrous self and battled X-23.
Cullen was eventually subdued after Reptil, Chase and Nico returned and Nara sacrificed herself to return him to normal. Near the finishing ends of Murderworld, Cullen manage to survive. However he suffered severe wounds towards the final day, but later rescued by Captain Britain along with several other super heroes.
Years later, he met his other sister, Lyra, who had been cast to unknown parts of the cosmos by their father millenia before. Elsa and Cullen were suspicious at first, but eventually accepted Lyra into the family, and she helped Cullen get free from the Glartrox.
- Darkness Repression: The Bloodgem suppresses the darkness inside Cullen.
- Super Strength: Like his father and sister, Cullen has greater strength than the average human.
- Healing Factor: Under the effects of the Bloodstone boasts an accelerated regenerative process that enables him to recover from wounds at an accelerated rate.
- Superhuman Durability and Superhuman Stamina: Like his father and sister, Cullen has greater durability, resilience, and stamina than the average human.
- Superhuman Reflexes: Like his father and sister, Cullen has reflexes faster than the average human.
- Superhuman Senses: Like his father and sister, Cullen has superhumanly acute senses.
- Expert Marksmen: Cullen has shown a high degree of marksmanship with firearms and has been trained in the use of various weapons having been trained by his father.
Various high-powered weapons
- Apex mentions that Cullen is frowny and tries very hard to be unpopular.
- Cullen has a not-so-secret crush on Aiden.
- He has kissed the mutant Rictor 
- Apex describes him as brilliant and more formidable than he looks. He is extremely perceptive and was able to pick up right away that Apex was the reason behind Death Locket's attack and her motives.
- 28 appearance(s) of Cullen Bloodstone (Earth-616)
- 1 minor appearance(s) of Cullen Bloodstone (Earth-616)
- 3 mention(s) of Cullen Bloodstone (Earth-616)
- 51 image(s) of Cullen Bloodstone (Earth-616)
- 5 quotation(s) by or about Cullen Bloodstone (Earth-616)
- 1 item(s) used/owned by Cullen Bloodstone (Earth-616)