Archie Sylvest

Professor Archie Sylvest was the father of Romulus and Remus Sylvest. He was worried that his sons' mathematical genius could be used to alter reality on a massive scale. When he discovered that they had been abducted, he alerted the Interplanetary Pursuit Squadron, who sent Hugo Lang to find them. (TV: The Twin Dilemma)

Behind the scenes
In the novelisation, he is given the first name Archie.