A very friendly and eccentric scientist who resides in an old castle tower in Nutwood, who invents many incredible devices during the series.
Rupert often helps out with his experiments. Once the Professor starts an experiment, he never rests. He has the catchphrase, "Think of the possibilities, my boy(s)!" whenever he is explaining his experiments and all the benefits that can come from it to Rupert and his friends.
"...Think of the possibilities!"