The 5 foot (163cm) long Ultra Probe was the seen in the fly-pasts during the journey to the planet Ultra. It was twice the size of the smaller model and half the size of the larger model (which was not a complete model, comprising only the command module, forward neck and front part of the cylinders).
The details on the model are quite different from the other two models, although on screen this isn't visible. Kit parts include the Tamiya Kit 1:35th Scale Sd.Kfz.232 Schwerer Panzerspähwagen 8-Rad "Afrika-Korps" (No.35297, released in 1974). The rear engine bells were made from tea dispensers. Photos thanks to Phil Rae.
After the series, the model was refurbished and repainted by Martin Bower, changing some of the original detail. Photographs by Phil Rae.
Below: the command module, photographed by Martin Willey
Copyright Martin Willey. Photos thanks to Phil Rae.