|Date(s):||2015 - present|
|Type:||Big Bang - Fanfiction, Fanart|
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The Winteriron Bang is a big bang challenge in Marvel fandom, focused on the pairing of Bucky Barnes/Tony Stark. Authors have to write a minimum of 5000 words for a mini-bang or 15,000 words for a big bang. Artists have to create a minimum of one piece for a mini-bang and two pieces for a big bang of a medium of their choice. An annual reverse big bang began in 2018.