Plot: The Scarecrow is poisoning athletes with fear, and accidentally gets Robin as well. Now Robin must overcome his fear before the Scarecrow causes a mass panic at a Gotham Knights game.
Design-wise, the return of the Scarecrow is great. The score brings back the high string theme from Nothing to Fear throughout, and the use of shadows and light create a real horror movie atmosphere. Also like Nothing to Fear, the animators have fun with the fear induced hallucinations, the athletes turning into the monsters and the street spiraling away from Robin as he dangles on a rope. And they've greatly improved the Scarecrow design, giving him a crooked smile and crazy eyes, so his head looks like a Jack-O-Lantern rather than sock.
The highlight is our first real visit inside Arkham Asylum. We've seen it briefly, usually at the ends of episodes to let us know where Mr. Freeze ended up. But here we actually see inside, with its long corridors of deep shadows and its policy of allowing patients to wear their costumes in their cells. It's no wonder no one seems to recover here. The scene of Batman walking along the row of cells, each one filled with a villain we've previously seen, The Joker playing solitaire with a deck of Jokers, Two-Face flipping a coin, Poison Ivy, reasonably moved from Stonegate Prison, protecting her plant, builds tension and dread before the reveal that the Scarecrow has, in fact, escaped.
And his plan is full of holes. Why didn't any of the Scarecrow's doctors notice he was missing before? Why is Batman the only one who suspects the athletes are being drugged? Wouldn't doctors test for that? Why didn't the Scarecrow use a lower dose, or less often, or bet at different bookies, to not draw attention? Why does he have to be at the game to drug the player or make the bet, and why does he have to be there in costume? Why does he need money in the first place? Can't he just steal chemicals like a respectable Man-Bat does?