One day, when he was taking the subway he witnessed Sun Girl's fight with the Evolutionaries to save the Morlocks, and helped her until they are both saved by the members of the New Warriors, Justice and Speedball. Together they saved Nova, Hummingbird, Kaine, and Water Snake from the Evolutionaries in Wundagore Mountain and stopped the High Evolutionary from detonating his bomb.
Powers and Abilities
Energy Absorption: Mark can absorb most types of energy directed toward him as if he was "eating" it, and store inside his body. The nature of his powers makes it difficult to damage him with energy-based attacks, while also enabling him to work well with any energy-using teammates.
- Energy Blasts: He can re-channel the absorbed energy through his body and shoot it from his mouth as powerful energy blasts.
- Transformation: If Mark absorbs high amounts of energy he became engulfed by it and transform temporarily into an enormous dragon-bull like creature, increasing his already impressive physical build.
- Physical Augmentation: His monster form strengthens Haechi even further granting him augmented strength as well as affording him a measure of invulnerability.
- A Haechi is a mythological creature from Korean and Chinese legends.
- Though being named Haechi in New Warriors (Vol. 5) #4's recap, then in his presentation in New Warriors (Vol. 5) #5, it's only a few pages later that his "super hero name" is first mentioned by Speedball who suggest him "maybe something dragon related". The name is used in-universe only at the end of New Warriors (Vol. 5) #6, and explained in New Warriors (Vol. 5) #7.
- 11 appearance(s) of Mark Sim (Earth-616)
- 2 minor appearance(s) of Mark Sim (Earth-616)
- 13 image(s) of Mark Sim (Earth-616)