Board Thread:The Panopticon/@comment-1293767-20151029072618/@comment-27920493-20161214200349

The clear, indisputable and, most importantly, official multi-parters in the revived series are:

Series 1 Aliens of London / World War Three The Empty Child / The Doctor Dances Bad Wolf / The Parting of the Ways

Series 2 Rise of the Cybermen / The Age of Steel The Impossible Planet / The Satan Pit Army of Ghosts / Doomsday

Series 3 Daleks in Manhattan / Evolution of the Daleks Human Nature / The Family of Blood Utopia / The Sound of Drums / Last of the Time Lords

Series 4 The Sontaran Stratagem / The Poison Sky Silence in the LIbrary / Forest of the Dead The Stolen Earth / Journey's End

Series 5 The Time of Angels / Flesh in Stone The Hungry Earth / Cold Blood The Pandorica Opens / The Big Bang

Series 6 The Impossible Astronaut / Day of the Moon The Rebel Flesh / The Almost People

Series 7 None (all episodes are officially standalones)

Series 8 Dark Water / Death in Heaven

Series 9 The Magician's Apprentice / The Witch's Familiar Under the Lake / Before the Flood The Zygon Invasion / The Zygon Inversion

Prior to Series 9, everything was clear cut. In Series 9, only TMA/TWF, UTL/BTF and TZI/TZI are clear two-parters, TGWD and TWWL are down to interpretation, and so are FTR, HS and HB. Some people consider TGWD and TWWL are two-parter, some people don't, some people consider FTR, HS and HB a three-parter, some people consider HS and HB a two-parter, and some consider them to be standalones. AGMGTW and LKH are official standalones, TGWD and TWWL aren't officially designated as a two-parter, and FTR, HS and HB aren't offically designated as a three-parter or a two-parter. Only the multi-parters listed above are official, and therefore only they should be listed as such.