This is the complete list of every Outside Crossover related to Slender Man.
Marble Hornets[]
The Marble Hornets series is inspired on Slender Man.
Minecraft[]
The Enderman in Minecraft, added in Beta 1.8, is based on Slender Man.
How It Should Have Ended[]
Slender is parodied in "The Slender Games".
Lost Girl[]
The Lost Girl episode "SubterrFaenean" features references to Slender Man.
Annoying Orange[]
Annoying Orange vs Slender is a parody of Slender and characters play Slender games in later episodes.
Bit.Trip[]
A character looking like Slender Man appears in Bit.Trip Runner 2.
Total Drama[]
A person looking like Slender Man appears in one of the tv screens on Total Drama All-Stars in the episode Moon Madness.
My Little Pony[]
A pony version of Slender Man appears in the My Little Pony: Friendship is Magic episode "Pinkie Apple Jack".
Eddsworld[]
Slender Man appears in the episodes "Fun Dead" and "The Chronicles of Santa".
Plants vs. Zombies[]
Plants vs. Zombies: Garden Warfare features the cameo of a character looking like Slender Man from the Slender series.
Supernatural[]
The titular creature from the Supermnatural episode "#THINMAN" is based on Slender Man.
Watch Dogs[]
Drawings of Slender Man can be found on the walls.
Smosh[]
Slender Man appears in The New Slenderman.
Kingdom Death[]
Kingdom Death: Monster includes an expansion based on Slender Man.
Superstore[]
Bo mentions Slender Man in Season 2, Episode 20 of Superstore, “Spring Cleaning”.
The Haunted House[]
Slender Man appears as a Ghost in Episode 8 of Season 2 (The Haunted House: Birth of Ghost Ball X), he uses his ability to open his mouth to snapshot on other kids.
Perfect Cell Vs[]
Slender is parodied in the Perfect Cell Vs episode "Perfect Cell Vs Slenderman".
Gravity Falls[]
Slender Man appears in Gravity Falls: Lost Legends.
Big Mouth[]
Slender Man appears in the Big Mouth episode "The Planned Parenthood Show".
Solar Opposites[]
Slenderman was mentioned in the Solar Opposites episode “The Booster Manifold”.
Choo-Choo Charles[]
Choo-Choo Charles features a side quest that references Slender.