Pathfinders in Space (Trilogy) was a set of ITV childrens' television series that ran from 1960-1 based on the exploration of the Moon, Venus and Mars. It was produced by Sydney Newman. There was also a prequel series (starring Frazer Hines) that has been lost. The series is considered one of the three central influences on Doctor Who, the others being Journey into Space [1] and and Quatermass.