Several robberies take place at major companies, including Wayne Enterprises, and Bruce Wayne, as Batman, discovers the thief to be a mechanical briefcase. Bruce meets with his old friend, Karl Rossum, an expert in robotics who lost his daughter to a vehicle accident years ago. He also meets Rossum's assistant, Randa Duane, and Rossum's ultimate creation: a prototype A.I. known as Holographic Analytical Reciprocating Digital Computer (H.A.R.D.A.C.) Bruce invites Duane to dinner, and around the same time, certain civilians start acting strangely. Most surprising is when Duane unexpectedly leaves Wayne Manor while Bruce is on the phone, and the entire Batcave turns on Batman.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
Batman manages to free himself from the Batcave's security system and bring it back under his control, although he fails to track down Ms. Duane. Barbara Gordon approaches Batman to inform him of her father's sudden change in behavior. A brutal fight between Batman and Harvey Bullock ensues, during which Batman damages Bullock and discovers him to be an android, revealing that the real Bullock and James Gordon have gone missing. Batman knows who the culprit is: HARDAC. Batman must stop the evil supercomputer before it completes its replacement plan.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Batman: The Animated Series episodes. HTML formatting and reference markers removed. · Content license