Betrayal

Sontaran Commander Stenck acknowledged that he was committing the "ultimate betrayal" by releasing the Lupari shield which he had previously promised as a means of protection for the Daleks and the Cybermen from the final Flux event, resulting in the destruction of their space fleets. Indeed, the Dalek War Fleet, upon seeing that the Lupari ships were reforming, observed "this is a betrayal". (TV: The Vanquishers ^[+]Loading...["The Vanquishers (TV story)"])

Davros betrayed his own people by helping the Thals destroy their dome to prevent leading members from preventing the origin of the first Daleks. (TV: Genesis of the Daleks ^[+]Loading...["Genesis of the Daleks (TV story)"]) During the Dalek-Movellan War, the Dalek Supreme of the Kembel Faction accused Davros of betraying the Daleks by forming an alliance with the Movellans. When this was revealed to be but a ruse to lower the First Movellan's guard so Davros could upload a computer virus into the androids' network, the Supreme instead praised Davros's loyalty, the Dalek creator stating that he would never betray his creations. (AUDIO: The Triumph of Davros ^[+]Loading...["The Triumph of Davros (audio story)"]) Professor Lorraine Baynes said how the Daleks repeatedly betrayed Davros, to which the Sixth Doctor arrogantly announced he beat him fair and square. (AUDIO: Davros ^[+]Loading...["Davros (audio story)"]) Dalek Caan, Dalek Thay, and Dalek Jast turned on Dalek Sec for becoming more human than Dalek, and for choosing to help the Tenth Doctor and the humans. Sec reacted by declaring they betrayed him. (TV: Evolution of the Daleks ^[+]Loading...["Evolution of the Daleks (TV story)"]) In the post-Time War, New Dalek Empire, Davros accused Dalek Caan of betraying the Daleks after learning of his role in manipulating events so that Donna Noble would become the DoctorDonna and thus prevent the New Dalek Empire from detonating the reality bomb. Caan retorted that, having broke through the time lock, he had saw the Daleks, the truth of what they had done throughout time and space and decreed "no more". The Supreme One assumed that the failure of the reality bomb was a betrayal by Davros and attempted to exterminate him only to be destroyed by Jack Harkness. (TV: Journey's End ^[+]Loading...["Journey's End (TV story)"])

The young Silurian, Morka, betrayed Okdel for sympathising with humans and took over as leader. (TV: Doctor Who and the Silurians ^[+]Loading...["Doctor Who and the Silurians (TV story)"])

The Twelfth Doctor considered Clara Oswald to have betrayed him when she attempted to force him to undo Danny Pink's death, though he noted he cared for her enough that betraying him made no difference in their relationship. (TV: Dark Water ^[+]Loading...["Dark Water (TV story)"]) In an alternate timeline however, the Twelfth Doctor initially did not forgive Clara for her betrayal, evicting from the TARDIS, though he eventually forgave her and came to regret his decision. The alternate Twelfth Doctor, knowing his timeline should not be, attempted to brainwash his past self to not forgive Clara's betrayal, only for a past version of Clara to convince him to halt his scheme. (COMIC: Four Doctors ^[+]Loading...["Four Doctors (comic story)"])

In the Unbound Universe, the Brigadier declined to return to England because of, among other things, being betrayed by people he'd thought were friends. (AUDIO: Sympathy for the Devil ^[+]Loading...["Sympathy for the Devil (audio story)"])

When the New Dalek Paradigm took Clara Oswald hostage during the Siege of Trenzalore, the Eleventh Doctor dismissively told them to kill her. Too afraid of the Doctor and the possible return of the Time Lords to go through with it, the Dalek leader taunted Clara about the Doctor's betrayal of her only for the human to point out that the Daleks would kill her regardless of the Doctor's actions, declaring that she did not fear the Daleks. (TV: The Time of the Doctor ^[+]Loading...["The Time of the Doctor (TV story)"])