Iman Crosson (born March 27, 1982), better known by his stage name Alphacat, is an American actor, impressionist and YouTube personality and is known for his impersonations of former U.S. President Barack Obama and his starring role in independent film "Along the Roadside".
"Gangnam Style" (Korean: 강남스타일 , ] ) is the 18th K-pop single by the South Korean musician Psy.
 The song was released on July 15, 2012, as the lead single of his sixth studio album "Psy 6 (Six Rules), Part 1", and debuted at number one on South Korea's Gaon Chart.
 On December 21, 2012, "Gangnam Style" became the first YouTube video to reach one billion and two billion views.
 The song's music video has been viewed over 2.9 billion times on YouTube, and was the most viewed video on YouTube from November 24, 2012, when it surpassed the music video for "Baby" by Justin Bieber featuring Ludacris, to July 10, 2017, when it was surpassed by the music video for "See You Again" by Wiz Khalifa featuring Charlie Puth.
Jonathan McIntosh is an American producer, writer, artist, and cultural critic.
 He is the creator of the Pop Culture Detective Agency video series examining intersections of politics, masculinity, and entertainment.
 He was also a producer and co-writer on the Tropes vs. Women in Video Games YouTube video series.
"Barack Obama vs. Mitt Romney" is a song and music video, performed by Iman Crosson, Peter "Nice Peter" Shukoff, and Lloyd "EpicLLOYD" Ahlquist.
 It is the 8th episode of the 2nd season of the YouTube video series "Epic Rap Battles of History".
 The video was released on 15 October 2012 on the show's YouTube channel in anticipation of the 2012 US presidential election.
Toby Terrier was a toy dog manufactured in the early 1990s by Tiger Electronics.
 The toy was designed to make various comments and remarks when placed in front of a television playing one of the select PLUS videos from the "Toby Terrier and His Video Pals" video series.
 In order for this function to work a specific cartridge that matched up with the video being played would have to be inserted into the toy.
 His collar contained a sensor that tracked what was going on in the movie.
 It was activated by pressing a button located below the sensor.
 The Toby Terrier video series was a comical and educational video series for kids, whose characters consisted of dog puppets.
 The video series itself was known as "Toby Terrier and His Video Pals".
Feras Bugnah (born September 29, 1987) is a Saudi Arabian filmmaker, video blogger and actor.
 His YouTube video series, called "Malob Aleyna", or "We Are Being Cheated", highlights social inequalities and political issues that the group of filmmakers feels are being overlooked by the Saudi government and specifically King Abdullah.
 He was reportedly arrested in 2011 for a particular episode of this series that exposed poverty in Riyadh.
 He is also known for a series called Malub Aleina/Malob Aleyna in which he educates viewers on the viewpoints of members of Saudi's lower classes.
"Einstein vs. Stephen Hawking" is a song and music video, performed by Zach Sherwin, Peter "NicePeter" Shukoff, and Lloyd "EpicLLOYD" Ahlquist.
 It is the 7th episode of the 1st season of the YouTube video series "Epic Rap Battles of History".
 The video was released on 30 March 2011 on Shukoff's YouTube channel.
Tropes vs. Women in Video Games is a YouTube video series created by Anita Sarkeesian examining gender tropes in video games.
 The series was financed via crowdfunding, and came to widespread attention when its Kickstarter campaign triggered a wave of sexist harassment against Sarkeesian.
The Demon Headmaster is a British television series based on the children's books by Gillian Cross of the same name.
 Made for CBBC, the drama was first broadcast between 1996 and 1998.
 The first series contained six episodes, and aired twice weekly from the 2nd to the 18th January 1996, the second series contained seven episodes, and aired weekly from 25 September to 6 November 1996, and the third series contained six episodes, and aired twice weekly from 6 to 22 January 1998.
"Crystallize" is a song by American violinist Lindsey Stirling from her self-titled studio album, "Lindsey Stirling".
 The song was released as a music video on YouTube on February 23, 2012.
 The video proved to be a success, with more than 42 million views at the end of the year, and was the eighth-most watched video of 2012.
 The song became Lindsey Stirling's album's lead single due to its success.
 The song appeared on three "Billboard" charts and, according to Nielsen SoundScan, by April 2013 it had reached 234,000 digital sales.
 On February 4, 2014, almost two years after the release of the video, "Crystallize" earned Stirling's first RIAA certified gold record by selling 500,000 copies in the United States.
 At the end of 2013, on the year-end chart, "Crystallize" finished first in the chart of Classical Digital Songs.
 On July 27, 2014, the official music video reached 100 million views, being Stirling's first YouTube video in doing so.

Question: What Youtube video series contained the music video performed by the person with the stage name of Alphacat?
Answer: Epic Rap Battles of History