Batman: The Animated Series Re-Watch: Episode Twenty Three: Vendetta
Plot: When Spider Conway, a prisoner about to testify against Rupert Thorne, disappears in an explosion, Batman suspects that Harvey Bullock is behind it. But Harvey is being framed by Killer Croc, a monstrous reptile man Bullock sent to jail two years ago.

But here we have an episode where Batman is just wrong, and he's going after an innocent man, specifically Harvey himself. If Batman had REALLY interrogated Bullock, showed up in his room, roughed him up, and threw him off a roof (as he does with Thorne), then they could have SHOWN that Bullock has a point, that there should be limits on what Batman can do.

I mentioned before that I find Killer Croc to be a boring villain. My problem with him is that there isn't much to him. He was born looking like a crocodile for never explained reasons, he is superstrong, and he pursues a life of crime. But he's fine here. The plot requires a villain Batman hasn't heard of before (so the Penguin's out) who will also be formidable physical threat once he's revealed. And that's all Croc is and needs to be, a good visual and reasonable threat.

(Spider Conway, by the way, is named after Killer Croc's creator, Gerry Conway.)

One really off note in the plot, however, is how Batman begins to suspect Croc. First, Croc leaving behind one of his scales at a scene of a crime seems awfully careless for a guy who purposely left a toothpick at the same scene to frame Bullock. If they were going to find the toothpick, they were going to find the scale. But, whatever, Batman needed to find a clue somehow.
But it gets worse. Looking at a thing that looks reptilian but is actually human, does Batman go through police records and databases to see if anyone fits that description, particularly someone Bullock arrested in the last few years? Nope. He has no clue what to do with that until Alfred says "microwavable crock." Great detective work there, Bruce.
However, THAT doesn't lead him to Croc either, only that he's looking for some kind of crocodile-man. Does Bruce check out a book on crocodile behavior? Does he ask questions of the zoo's reptile expert? Does he knock on Kirk Langstrom's door to see if he was making Man-Crocodile? Nope. Bruce goes to an animatronic exhibit for children at the theme park "Ocean World." It is one of the stupidest things I have ever seen, and even if it was meant to be campy funny, it's so out of tune with the dark crime fiction feel of the rest of the episode that it stands out like, well, a giant grey man-crocodile.