Troughton returned to "Doctor Who" three times after formally leaving the programme, returning to the character more than any other actor who portrayed the Doctor after ending his regular connection with the series. The first of these occasions was in "The Three Doctors", the 1972–73 serial opening the programme's 10th season. In 1983, Troughton overcame some reluctance to reprise his role and agreed to appear in the 20th anniversary special "The Five Doctors" at the request of series producer John Nathan-Turner. He also agreed to attend "Doctor Who" conventions including the show's 20th anniversary celebrations at Longleat in 1983. He also appeared around the world with Nathan-Turner. Troughton enjoyed the return to the programme so much that he readily agreed to appear one more time as the Second Doctor, with Colin Baker's Sixth Doctor in "The Two Doctors" (1985). Reportedly, he also advised the Fifth Doctor, actor Peter Davison, to limit his time in the role to three seasons to avoid typecasting and the younger actor followed this advice.