Carl Tanner

Dr. Carl Tanner was a scientist and friend of David and Tina McGee, who was secretly doing illegal experiments to create mutations. When he was confronted by Tina and the Flash, he injected himself with the serum, turning into the Nuge, and tried to inject Tina too, before ultimately being taken down.

Behind the scenes

 * A similarly named character, Dr. Carla Tannhauser, appears in the 2014 Flash TV Series as the mother of Dr. Caitlin Snow/Killer Frost.