Invasion (S02E20)

S02E01 The Ultimate Thrill S02E01 Planet of Giants S02E02 Cult of the Cat S02E02 Dangerous Journey S02E03 Critters S02E03 Crisis S02E04 World's End S02E04 Animal Act S02E05 The Daleks S02E05 Old Wounds S02E06 Day of Reckoning S02E06 Legends of the Dark Knight S02E07 The End of Tomorrow S02E07 Girl's Night Out S02E08 The Waking Ally S02E08 Chemistry S02E09 Flashpoint S02E09 Judgment Day S02E10 Beware the Creeper S02E10 The Powerful Enemy S02E11 Mad Love S02E11 Desperate Measures S02E12 The Slave Traders S02E13 All Roads Lead to Rome S02E14 Conspiracy S02E15 Inferno S02E16 The Web Planet S02E17 The Zarbi S02E18 Escape to Danger S02E19 Crater of Needles S02E20 Invasion S02E21 The Centre S02E22 The Lion S02E23 The Knight of Jaffa S02E24 The Wheel of Fortune S02E25 The Warlords S02E26 The Space Museum S02E27 The Dimensions of Time S02E28 The Search S02E29 The Final Phase S02E30 The Executioners S02E31 The Death of Time S02E32 Flight Through Eternity S02E33 Journey into Terror S02E34 The Death of Doctor Who S02E35 The Planet of Decision S02E36 The Watcher S02E37 The Meddling Monk S02E38 A Battle of Wits S02E39 Checkmate