Scarecrow is a fictional DC comics villain who is portrayed as an enemy of Batman. He uses a gas called fear toxin to drive his enemies into complete fits on insanity.
Scarecrow worked with Sinestro and used his fear toxin all over Gotham, driving its citizens into complete madness and insanity. His obligation was complete at long last.
Scarecrow appears as a boss and playable character in this crossover game between Lego Batman (hence the title) and Lego Marvel. He teams up with Killer Croc to escape from Arkham Asylum, only to end up fighting a group of supervillains led by Lex Luthor whoa re also trying to escape. Scarecrow is unlocked after the level (What Do You Have Against Asylums?) is complete.