The Cosmonaut Cover-Up (1999)

A documentary which claims that Yuri Gagarin was not the first man in space, in fact it was test pilot Vladimir Ilyushin. However, his flight into space went wrong and he crash landed in China and was badly injured. 

This is a great story though little actual evidence is provided. Rather disappointingly Ilyushin himself declined to speak on camera about it despite the film makers claiming he was going to. So, all we really have is a lot of hearsay, obscure old news snippets and unsubstantiated claims. 

However, despite that this documentary is well worth watching due to the Soviet era footage of space development and training much of it is completely compelling and fascinating.