25. The Brigadier Puts His Life On The Line For Seven
http://www.youtube.com/watch?v=tP6T1wcFwms Brigadier Leftbridge-Stewart was there back in the days of Two and Three, and he remained a recurrent face throughout the Classic series. It's only right that he got to fight on behalf of the Doctor, given how often the Doctor had saved both him and UNIT. It's a touching moment in the show in which the Brigadier proves himself as much as the action hero as the Third Doctor, and though the Doctor may change, the Brigadier will always be one of his loyalist companions. He may not have appeared in the show for over twenty years, but his legacy lives on; actor Nicholas Courtney was honoured in 'The Wedding of River Song', after his death in 2011. 24. "Everybody Lives!"
http://www.youtube.com/watch?v=jhklrve5xmw This was the moment that the Doctor finally let go. He learnt to accept what had happened in the Time War and he learnt how to be the Doctor again. Russell T Davies was the master of the tragic ending, from John Simm's Master dying in the Doctor's arms, to Donna losing all her memories. But in 'The Doctor Dances', Steven Moffat gave us a rare happy ending: everything worked out okay in the end, and everybody lived. Doctor Constantine, the Doctor who had lost everything was given a second chance at life, and he wasn't the only one. 23. The Cybermen Return in Earthshock
http://www.youtube.com/watch?v=wJAr3M0F3fw They'd been gone for seven years. Imagine the audience's surprise when the Cybermen made their return: back, stronger and scarier than ever. Earthshock is one of the Cybermen's defining stories, despite the fact that it was made completely secret that the villains would be returning. The suspense in this cliffhanger however - the second Davison cliffhanger in this list - is the definition of the adrenaline-fuelled darkness that NewWho would base itself on. A hugely influential and dramatic episode. 22. Yana Regenerates Into the Master
http://www.youtube.com/watch?v=yhMjRFsJi9s It had taken three years to totally destroy the memories of any other living Time Lord, and a whole lot of David Tennant declaring "I'd know if there was another one." But Derek Jacobi's transformation from gentile Professor Yana into the snarling Master is one of Who's finest plot-twists. The reveal is executed perfectly, from the repeating of the Face of Boe's message, to the look of absolute terror on Ten's face. He was only the Master for an episode - he only knew he was the Master for ten minutes at the most - but it was a defining performance of the character, and a hark back to the calculated days of Roger Delgado, before John Simm took the character into deranged new territory. 21. Nine Regenerates
http://www.youtube.com/watch?v=qa3NM9Jhkn0 There are always those who have issue with Ten's regeneration. He was fury and rage and the heart of the sun, and yet he whimpered and cried, "I don't want to go" before he died. How did that happen? But hard-as-nails Northerner Eccleston had no such death. Really, we'd never have known that he wasn't a fan of the old series: in one short scene, he manages to convey the disappointment of the audience knowing he's leaving, the fear of the Doctor wondering what will happen, and the pain of the poisoning he's going through. And then, bowing out in the only way he could, he confirms that yes: he was fantastic as well. Christopher, we miss you. One day, come back? Yes. One day, come back.