10 Best One Time Only Characters In Batman: The Animated Series
5. Sidney Debris
The Man Who Killed Batman focuses on Sidney Debris, who is an incredible bungler, but an oft-times funny and sympathetic one.
Eager to break into Gotham's rackets, "Sid the Squid" sides with a gang of drug runners working for Rupert Thorne, who attempt to use Sidney as a distraction for Batman. They are amazed when Sid actually sends Batman plunging off of a rooftop into a gas tank, which then conveniently explodes; only Sid knows that Batman's "death" was just an unintended accident.
Whilst the criminal underworld rejoices in its newfound freedom, Harley Quinn brings Sid before The Joker, who is distraught that he did not kill the Dark Knight. The Clown Prince of Crime soon attempts to avenge himself upon Sidney, only for an unseen guardian angel to save Sid so that he may seek sanctuary with Thorne.
This is often regarded as one of the show's best episodes, even though it only features brief appearances from Batman. Indeed, it is the supporting cast who carry the episode and Matt Frewer characterizes Sid's clumsiness and naivety nicely.