aka Dr. Kirk Langstrom
was a scientist who turned himself into an evil half-man, half-bat monster. In Batman: Arkham Forever
, he is captured by Deathstroke
and held hostage at STAR Labs
In the mini-comic, Kirk is mentioned by Black Mask. Later in the series, he, Clayface, and Amygdala are freed by Two-Face, and try escaping, but are stopped by Batman.