The Box of Delights (TV series)
Patrick Troughton was a familiar face on BBC TV from playing the Second Doctor in "Doctor Who"; a contemporary "Blue Peter" feature on the drama makes the connection that in the role of Cole Hawlings, the kindly Punch and Judy Man, Troughton was playing another mysterious, scruffy time traveller. Renny Rye noted that Troughton "who was my favourite Doctor Who...had a quality that is unsurpassed, I think, as someone to pull you into a tale."
David Langton
In 1968 director Douglas Camfield chose Langton to portray Colonel Lethbridge-Stewart in the "Doctor Who" serial "The Web of Fear", but Langton dropped out to perform in a TV play before production began, so Camfield gave the part to Nicholas Courtney, who had originally been cast in different role. As played by Courtney, the character of Lethbridge-Stewart (better known as the Brigadier) returned to "Doctor Who" the next year and became one of its most recognisable supporting characters, appearing in "Doctor Who" irregularly until 1989 and making a final appearance in spin-off "The Sarah Jane Adventures" in 2008.