Dalek Death Squad spacecraft

The Dalek Death Squad spacecraft was a Dalek saucer which was manned by the Death Squad Daleks. This variant of saucer was modified with sensors and weaponry optimised to track down "deviant manifestations" of the Dalek race. (PROSE: Dalek Combat Training Manual) One such saucer saw action when a Death Squad was summoned by the Thirteenth Doctor to deal with the new Defence Drone Daleks. (TV: Revolution of the Daleks)

The saucers of the Dalek War Fleet resembled those (TV: The Vanquishers) used by Death Squads. (TV: Revolution of the Daleks)

History
In 2021, with the clone of the Recon Dalek and his army attempting to exterminate the human race on Earth, the Thirteenth Doctor decided that the only chance was the nuclear option of summoning more Daleks to deal with the ones already on Earth. Broadcasting the Recon Scout's signal throughout the Time Vortex, the Doctor was able to draw the attention of a Dalek Death Squad spacecraft and the Death Squad Daleks aboard it.

Upon arriving at Earth, the Daleks detected the impure Daleks on the planet below and thousands of Daleks were dispatched from the ship across the planet to exterminate them. With her plan working, the Doctor dispatched Jack Harkness, Ryan Sinclair and Graham O'Brien to blow the ship up, although she ordered them not to detonate before they were sure that the SAS Daleks had destroyed all of the other Daleks on Earth and not before the group got out. Teleporting aboard using Jack Harkness' vortex manipulator, the three men spread out and began planting explosives supplied by Jack all over the ship, avoiding the command centre where most of the Daleks were located. However, Jack Robertson betrayed the group and was transported up to the ship where Jack witnessed him informing the Dalek leader of the Doctor's presence and the trap she had laid for them. The cloned Dalek teleported aboard the ship and made his case to the other Daleks, but was nonetheless exterminated for his impurity.

Jack warned the Doctor who knew that destroying the ship would not stop the Daleks still marauding through the Earth's skies. The Doctor enacted a plan using her spare TARDIS to lure in the Dalek forces and send them to the Void, destroying them. As the Daleks detected the Doctor's location, Jack, Graham and Ryan grabbed Robertson and fled as they were detected, attacked and cornered by the Daleks. Yasmin Khan signaled Jack who teleported the group out. As they teleported out, Ryan detonated the bombs, destroying the Dalek ship and all of the Daleks still onboard it. (TV: Revolution of the Daleks)

Behind the scenes
Archive footage of the Death Squad Daleks aboard their ship was used to depict members of the ill-fated Dalek War Fleet in The Vanquishers.