Dalek Thay is a recurring antagonist in the Doctor Who revival series, appearing as a member of the Cult of Skaro. He appears as a major antagonist in Series 2 and a supporting antagonist in Series 3.
He was voiced by Nicholas Briggs, alongside many other Daleks in the show.
Dalek Thay and the other members of the Cult of Skaro emerged from the void with the Genesis Ark in London in 2007 after they escaped the Time War. When they got there, they looked for someone who could help them force the ark open.
After fatally scanning Dr. Singh's brain, they learned that the Cybermen had invaded earth. Dalek Sec ordered Thay to investigate outside the room they were in, which the latter agreed to. When Thay found two Cybermen, he ordered them to identify themselves, which they responded to with a similar order and to modify. Thay inadvertently revealed what he was when he told them that daleks don't take orders. The Cybermen pointed out that they were similar beings but the daleks' appearance was inelegant. Thay stated that elegance was not a trait among the daleks. Regardless, the cybermen proposed an alliance with the daleks, which Thay rejected. This prompted the cybermen to shoot Thay. That prompted Thay to shoot both cybermen dead.
When the Genesis Ark released numerous daleks upon the world, The Tenth Doctor opened the rift that the cybermen came through and sucked everything back in that was covered in 'void stuff'. Because the Cult of Skaro were covered in it too, they would have been sucked in too. Because of that, the cult activated an emergency temporal shift and escaped.
The Cult ended up in New York City in 1930. There, they recruited Mr. Diagoras to help them revitalize the daleks by kidnapping innocent people. When adding edits to the Empire State Building, Dalek Thay had part of his exterial matter removed to be part of it. When Diagoras was summoned to meet Sec, Thay and the others were present. When Sec ordered the pig slaves to bring Diagoras to him, Thay stopped this for a moment, complaining that the procedure would contradict the Dalek Imperative. Sec convinced his follower that this was to save their race, which Thay conceded to but believed they had to saty pure, which Sec blamed on the daleks' extinction. Thay later joined Caan in sorting out which humans they captured should become pig slaves and which would become daleks, taking the latter to their laboratory. When they got there, they were present when Dalek Sec became a human dalek.
When the doctor met the cult in the laboratory, he caused a loud noise that distracted the daleks long enough for the doctor to escape with his allies. Sec ordered the daleks to give chase. Eventually, Caan caught up with Thay, asking if he had doubts about Sec's plans. Thay admitted he had. Later, Thay returned to the lab to show Sec a visual of Jast and Caan attacking the homeless denizens of New York. When Caan killed Solomon, Sec gasped in shock, which Thay caught. Sec ordered Caan to spare the doctor's life and simply have the doctor come to the lab, which he did. After Dalek Sec changed his mind about killing people, The other daleks no longer accepted Sec as their leader and promptly mutinied and imprisoned him before injecting the humans in their lab with a different gene solution.
When Dalek Thay & Dalek Jast ordered the 'Dalek Humans' to kill the doctor, the humans simply questioned their orders. The Doctor explained how he got in the way of the gamma strike which had brought them to life. His DNA had become mixed with theirs, giving them a dose of Time Lord freedom. A battle broke out between two Cult drones and the Dalek-humans. Jast and Thay were destroyed.
Dalek They was much like any ordinary dalek; always ready to destroy. He noticably took more onscreen action than his partner, Dalek Jast. Although more willing to serve in the Cult of Skaro than Caan, Thay did not always agree with his master, Sec and would sometimes voice his opinion towards him. When his leader suggested something that was beyond dalek society, that prompted Thay and the others to betray Sec, as merging with a human would be 'impure'.
- Thay initially had the second deepest voice of the Cult of Skaro, but when Dalek Caan became leader and gained Sec's voice, Thay was left with the deepest nasally voice.