RT Shorts episodes began again on August 28, 2010, until the second season's conclusion with its twenty-fourth episode and DVD release in early December. Shortly before season two's conclusion, Rooster Teeth collaborated with the team behind Mega64, a video game-centered comedy series. Together they produced four Rooster Teeth Shorts episodes, which were released on the Rooster Teeth website as the beginning of season three. Halfway through season four, Burns announced the cancellation of Rooster Teeth Shorts for several new series. However, on April 1, 2013, Rooster Teeth announced Rooster Teeth Shorts would return with a fifth season, on the same day, the season premiere episode Reunion was released and marked the tenth anniversary of the company. On August 22, 2013, Rooster Teeth released six 6-second mini-episodes exclusively through the video sharing service Vine. Six more were published on September 13, 2013. The third set was released on October 11, 2013, followed by a fourth set on November 8, 2013. Immersion Immersion is a series in which Burnie Burns and Gus Sorola (Griffon Ramsey in the first season) test the concepts of video games in real life, such as whether the heckling that sometimes occurs in multiplayer video games would negatively affect the performance of real soldiers. Burns joked in the Rooster Teeth podcast that the series started as an "elaborate way for [them] to do fun stuff and get paid for it." Geoff Ramsey and Gus Sorola were the test subjects throughout the first season. Gavin Free and Michael Jones served as the test subjects from the second season onwards. Various other Rooster Teeth employees have served as test subjects in certain episodes including Miles Luna, Kerry Shawcross, Blaine Gibson and Chris Demaris. During PAX East in late March 2010, Rooster Teeth released a teaser trailer for a series with a pilot episode that tested how easy it would be to drive a car from a third-person perspective. Nothing was mentioned of Immersion until October 2010, when Burnie Burns stated during the company's podcast, The Rooster Teeth Podcast, that production had begun on further episodes. Soon after, on November 23, 2010, the company released pictures on Reddit of a door in their office turned into a safe-room door from the video game Left 4 Dead to build hype for the series' debut the following day. The post became the most popular post of the day on Reddit. Rooster Teeth re-released