Squidge

Squidge was a chemical compound which made things bounce "ten times as high as rubber". Its inventor — Professor (The Sabre-Toothed Gorillas)|a professor]] whose name the Second Doctor John and Gillian never knew — additionally claimed that "you [could] do anything with it". He demonstrated that squidge could be used to make trampolines as well as highly effective weapons. When combined with a secret green chemical that removed elasticity, squidge produced super-strong, but super-light, clubs. The professor's so-called "squidge clubs" made an excellent defence against sabre-toothed gorillas because of their great, but highly manageable, mass. Squidge was even used to make range weapons, such as the Doctor's "squidge catapult" — essentially a rubber band stretched between two trees. Its greater elasticity allowed for its ammunition to be discharged at extremely high and damaging speeds. (TVC: The Sabre-Toothed Gorillas)