Matt Conagher was a brazilian sparta remixer. He has been on Youtube since January 2009 with different accounts, with Thunderbirds360TV being the longest and the most successful channel alive, created in November 2011. He used to make terrible Microsoft Sam videos and then, in 2012-2013, Downfall Parodies, therefor making him an unterganger.
Originally made a couple of Sparta Remixes mid-2012, however he stopped and only made another one in 2013. Other than a hiatus in 2014-2015, he's been active until early 2016, announcing his retirement, after stating that he was "sick of the 'community'".
The channel: http://www.youtube.com/user/Thunderbirds360TV