Twelfth Doctor
Peter Capaldi previously portrayed Lucius Caecilius Iucundus in the "Doctor Who" episode, "The Fires of Pompeii", and later played the Twelfth Doctor. The three characters are connected in that John Frobisher is a descendant of Lucius Caecilius Iucundas according to "Doctor Who" showrunner Steven Moffat, and the Twelfth Doctor subconsciously based his appearance on Lucius Caecilius Iucundus