Bessie: 

The Third Doctor's main mode of transport, during his exile on Earth, was this canary-yellow roadster. The vehicle's registration number was "WHO 1". After the Third Doctor's regeneration, the Fourth Doctor drove Bessie for a short time. Upon the Fourth Doctor's departure from Earth, Brigadier Alistair Gordon Lethbridge-Stewart had it "put into mothballs". It is later used by the Seventh Doctor during a visit to Earth during which he encounters the Brigadier and U.N.I.T. It's registration number this time was "WHO 7". The Doctor made several modifications to Bessie during his time at U.N.I.T. These included an anti-theft force field, a remote control, and a minimum inertia hyperdrive.

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