Notable appearances: Comics, Batman: The Animated Series
When Batman needs to dispatch a room filled with enemies without the luxury of time on his hands, he usually throws a few gas pellets their way. These various gasses are non-lethal ways to knock out opponents so the Dark Knight can get to work. These gasses usually include anesthesia or tear gas, and can either be thrown in capsule form or be shot out of a specialized gun that he carries at all times. These types of gadgets make Batman a one man SWAT team in his urban war against the mob and murderous psychopaths.