Sirius is a 2013 documentary film that follows the efforts of Steven M. Greer to reveal what he believes is information about top secret energy projects and propulsion techniques It is based on Greer's book, Hidden Truth, Forbidden Knowledge[2] and features interviews from former officials from the government and military who claim that the United States government is covering up the existence of Unidentified Flying Objects (UFOs) and extraterrestrial visitation. Also featured prominently are images and a DNA analysis of the six-inch human skeleton known as Ata that was found in the Atacama desert in northern Chile in 2003.

"Sirius" was directed by Emmy Award-winning director Amardeep Kaleka and features actor Thomas Jane as narrator. Greer also served as executive producer. The premiere was on April 22, 2013 at the Regal Cinemas and the Premiere House Theater in Los Angeles, California.[4] The film was simultaneously live streamed online by Yekra.