The teaser trailer for Interstellar debuted December 13, 2013, and featured clips related to space exploration, accompanied by a voiceover by Matthew McConaughey's character, Cooper. The theatrical trailer debuted May 5, 2014, at the Lockheed Martin IMAX Theater in Washington, D.C., and was made available online later that month. For the week ending on May 19, it was the most-viewed film trailer, with over 19.5 million views on YouTube.