Lambda is General Motors' full-size crossover SUV automobile platform. It is largely derived from the GM Epsilon platform, which underlies the Chevrolet Malibu sedan and similar models. The Buick Enclave concept car was previewed at the 2006 North American International Auto Show, and the Saturn Outlook was shown at the 2006 New York Auto Show. The 2007 Outlook and GMC Acadia went into production in late 2006, followed by the 2008 Enclave in mid-2007, and the 2009 Chevrolet Traverse in mid-2008.