The B.C. Buggy is an interdimensional vehicle in the shape of a chariot, built by Gyro Gearloose.
One of Gyro Gearloose's many time machines, the B.C. Buggy (dating back to 1965) takes the form of a chariot with a clock-like face and a pendulum on the front, which can be used to set the date and place to which one wants to travel. Once switched on, the B.C. Buggy will move in a circle, faster and faster, until it dematerializes and reappears in the past. If the Buggy travels through the Time Vortex at all, this is not visible to its occupants, who merely see the present landscape blur around them and then snap back into focus as the time period they picked.
Behind the scenes
The B.C. Buggy appears in the 1965 story Battle of Petras.