The items first appeared in the Very Scary Halloween Special event. They could be collected in the Eyeaduct map during the annual Haunted Halloween Special where a Haunted Halloween Gift would appear every five minutes on a server with 10 or more non-bot players. They were also available through the Mann Co. Store before November 8, 2011. Any gifts collected in the Underworld of Eyeaduct were awarded in the Haunted quality. Additionally, if the complete item set is worn, a special set effect could be applied.
While trying to stop a robbery, Spider-Man is blamed for the accidental shooting of an innocent bystander. This makes the web-slinger the perfect target for anti-super hero mayoral candidate Brian Timilty. However, Timilty is secretly the pawn of Tyler Stewart, a wealthy businessman seeking to take over New York's crime syndicates. Wanted by police and forced into hiding, Spider-Man must find a way to clear his name without being shot on sight. And that's when Electro and Rhino--two of his deadliest foes--arrive on the scene to complicate matters.
Rapper Kanye West makes a return to the South Park world, having fully teansformed into a "Gay Fish" (his only identification in the game) and seeking Sea-Man and the player's help to guide his "momma" to Heaven aboard a unicorn that farts rainbows. This is a reference to 'Only One', a real mobile game West is making about his real mother's ascension to Heaven.
Halloween costumes are costumes worn on or around Halloween, a festival which falls on October 31. An early reference to wearing costumes at Halloween comes from Scotland in 1585, but they may pre-date this. There are many references to the custom during the 18th and 19th centuries in the Celtic countries of Scotland, Ireland, Mann and Wales. It has been suggested that the custom comes from the Celtic festivals of Samhain and Calan Gaeaf, or from the practise of "souling" during the Christian observance of Allhallowtide. Wearing costumes and mumming has long been associated with festivals at other times of the year, such as on Christmas. Halloween costumes are traditionally based on frightening supernatural or folkloric beings. However, by the 1930s costumes based on characters in mass media such as film, literature, and radio were popular. Halloween costumes have tended to be worn mainly by young people, but since the mid-20th century they have been increasingly worn by adults also.