Aston Martin has unveiled its plug-in Hybrid Valhalla hypercar, which matches the Corvette ZR1's 1,064-hp and costs $1 million.The Valhalla features a 4.0L V8 engine sending 817 horsepower to the rear axle, while the front wheels are powered by electric motors.The hybrid powertrain consists of a twin-turbo V8, three electric motors, and a liquid-cooled 6.0-kWh battery pack.Aston Martin plans to produce only 999 Valhallas with an estimated base price of $1 million each.