Porsche unveiled its 918 Spyder Concept today at the Geneva Motor Show. The Porsche 918 Spyder concept is a plug-in hybrid equipped with a 500HP 3.4L V8 combined with two electric motors producing an additional 218HP. The open top two-seater has a top speed of 198mph and can reach 0-60mph in 3.2 seconds. Porsche claims it can deliver 78 miles to the gallon and run 16 hours off battery alone. Check out a promotional video and more pictures of the Porsche 918 Spyder concept below.