viagra canada no prescription cialis‘s http://uristocrat.com/2012/11/y-3-x-linda-farrow-2013-springsummer-eyewear-collection/ single “Sledgehammer” premiered this morning in IMAX theaters. Now, it’s available online. Directed by Floria Sigismondi, it features Rihanna singing the track on an alien planet. The iconic Starship Enterprise makes an appearance, too. Watch it below. Also below, watch Rihanna explain her love of Star Trek in a Facebook video.