The Adventures of Batman and Robin is probably one of the best representations of the caped crusader’s adventures in cartoons (second only to the original Robin-less Batman: The Animated Series!), so its episodes have been watched and universally loved by legions of Bat-fans, but unless you have a Sega Genesis with the Sega CD Add-On and a copy of the TABR game, you probably missed out on “The Lost Episode”.
The Lost Episode is basically a series of 16 minute, fully animated cutscenes found in the Sega CD game for The Adventures of Batman and Robin, which can be aranged to form a semi-cohesive story. The limitations of the 16 bit Genesis console and its Sega CD Add on meant that the videos were limited to a 256 color pallete, but the animation was done by TMS, and uses the original voice actors so it stands well on its own as a canonical episode from The Adventures of Batman and Robin TV series.
You can watch (or download!) all the cutscenes at www.toonamiarsenal.com/features/lostbatman/