Hester's history is unknown, until the day he escaped from prison. Hiding out in a leaky industrial plant, he was exposed to a toxic cocktail of chemicals which mutated him into the superhuman creature known as Slag. He helped found the mercenary team known as Tri-Ad, and fought the WildC.A.T.s.
Later, he came to the funeral of his teammate, H.A.R.M. He was captured there and held captive in VR by Tao.
Slag has appeared in the following non-WildStorm Image publications: The Deadly Duo Vol. 2 #3.
- 10 Appearances of Heinrich Hester (Wildstorm Universe)
- 1 Images featuring Heinrich Hester (Wildstorm Universe)
- Quotations by or about Heinrich Hester (Wildstorm Universe)
- Character Gallery: Heinrich Hester (Wildstorm Universe)