By Adam Markovitz
Updated August 20, 2009 at 09:40 AM EDT

Variety reports that Syfy has ordered 13 new episodes of its original series Warehouse 13, following a successful first-season run that earned the best ratings ever for the cable channel. The hourlong dramedy, which averages 3.7 million viewers a week in its 9pm Tuesday timeslot, follows a group of Secret Service agents who investigate supernatural objects.