Lethbridge-Stewart's last appearance in a "Doctor Who" television episode was in 1989, in the Seventh Doctor serial "Battlefield". Called out of retirement to deal with an other-dimensional invasion of armoured knights led by Morgaine, he found himself once again at the Doctor's side. Lethbridge-Stewart served as his world's champion as he faced down and killed the demonic Destroyer of Worlds armed only with his service revolver and a load of silver-tipped bullets. ("Battlefield" was stated to be a few years into Ace's future but not a specific date. The Virgin New Adventures books place it in 1997.)