The teenager who later became Grymm was once a member of the US military, then one day him and his unit were volunteered for some experiments. They all received Meta-powers, but Grymm was the only one to survive the testing and was now able to control peoples body with a paralytic toxin he generates from his skin. He later broke out of the lab and went on a criminal spree, until S.T.A.R. Labs stopped him and locked him up.
Grymm was created by Scott Lobdell and Brett Booth for there series Teen Titans
Major Story Arcs
Teen Titans: It's Our Right to Fight
For more information see: Teen Titans: It's Our Right to Fight
After a battle with Superboy, the Teen Titans are forced to take Kid Flash to S.T.A.R. Labs for medical attention from Static. While there Grymm, who is being held two floors up in a padded holding cell, hears the Titan's thoughts and hatches a plan for escape. Grymm then reaches out to the Titan's minds and after realizing Wonder Girl's mind was too stubborn and Bunker's was too happy, he feels Skitter's mind is perfect. He takes control of her and uses her to escape his cell. When Wonder Girl and Bunker come looking for their friend Grymm gets the jump on thern. He then tries to control their bodies but Bunker's power comes from his mind and he is able to blind side Gyrmm. Defeated it is assumed that Grymm is put back in his cell.
Powers and Abilities
Grymm is a Metahuman with the ability to channel emotions such as rage and use them as attacks. He is also capable of controlling people's bodies, but not their minds.