changed when they save his life. With the help of the Ice Warriors, the Doctor uncovers a plot by the High Priest, Hepesh (Geoffrey Toone), and the delegation from Arcturus, a world which is an old enemy of Mars, each with their own motives, to prevent Peladon's admission to the Federation. A sequel, The Monster of Peladon, aired in 1974 and was set 50 years after the events of The Curse of Peladon. Here, the Ice Warriors are depicted serving as Federation peacekeeping troops. The Ice Lord Azaxyr, however, leader of this force, was working with Galaxy 5, which was at war with the Federation. Seeking a return to the race's warrior past, he tried to impose martial law and take over Peladon but was stopped by the Peladonians, who were aided by the Third Doctor. As popular recurring monsters, the Ice Warriors have appeared in flashbacks and been referred to throughout the series history. During the Second Doctor's trial during The War Games, he lists the Ice Warriors as among many threats he has defended the universe against. During the Third Doctor serial The Mind of Evil, when forced to confront his fears by the Keller Machine, he sees images of his past enemies, including the Ice Warriors. The newly-regenerated Fifth Doctor (Peter Davison), during a moment of initial instability, makes mention of the Ice Warriors and the Brigadier in the 1981 serial Castrovalva. This has been seen as perhaps alluding to an unseen adventure. When confronted by alien sentient water in the 2009 episode "The Waters of Mars", the Tenth Doctor (David Tennant) theorizes that the Ice Warriors froze it in an underground glacier to prevent its escape, testing the virus by addressing it in Ancient North Martian as it reacts to his words, referring to them as "a fine and noble race who built an empire out of snow". The 2013 episode "Cold War" is the first to depict the Ice Warriors in the revived series and features the Eleventh Doctor (Matt Smith) encountering Grand Marshal Skaldak, a legendary warrior who had been trapped in the ice for 5000 years, on a sunken Soviet submarine. It is also the first televised story to depict an Ice Warrior without its armour. After Skaldak escapes from the ice, the crew manage to subdue him, which under Martian Law he believes is a declaration of war by humanity. After failing