Definition: Telasco is a fictional character from the science fiction television series "Doctor Who." He is portrayed by actor Christopher Eccleston, and he was created for the show in the 1960s as a companion to the iconic Doctor Who character. Telasco is a sentient alien who has been programmed with knowledge of many scientific theories and can communicate through telepathy. Despite his advanced technology, Telasco struggles to understand human language and often makes mistakes when trying to explain complex ideas.