The Mysterious House
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The Mysterious House is an animation created by Martin Walls in 2020. It is a 13 minute animation set on Halloween, featuring characters from The Walten Files in a non-canon setting. The episode is consistently scary and disturbing all the way through, however it does have what can be considered a screamer at around 11:30 where the main antagonist rips off his mask revealing a black, rotting and distorted face.
NOTE: The following video contains a screamer!