1999 Chrysler Citadel

Chrysler Citadel concept was a "hybrid-hybrid" — combining multiple vehicle and powertrain types. The car featured dual sliding rear doors and a retracting cargo door that could slide under the floor. The powertrain included a 3.5-liter, 253 horsepower V-6 that drove the rear wheels and a 70 horsepower Seimens electric motor to move the front wheels.

Sources: www.chicagoautoshow.com; www.auto.com