Doctor Who: 10 Problems With Revolution Of The Daleks

Near the beginning of the episode, Leo Rugazzi and Jack Robinson demonstrated their 'Defence Drone' to technology secretary Jo Patterson, which raised some interesting questions with viewers.

Rugazzi, having 'built' these Daleks, claimed them to be entirely solar-powered, just as classic 60s Invasion Daleks were, but operated by Artificial Intelligence. Without a mutant inside, the casing still acted like a normal Dalek - rolling into battle at a protest, emitting sonic waves as a weapon, gassing a crowd, and firing water jets from its energy gun. Regardless of the protest being staged, the Dalek would have operated without its mutant inhabitant perfectly well.

This begs the question, why did the regrown Daleks even need to teleport into their shells in the first place? If the shells could be remote-controlled and still function without the mutant inside, why risk the newborn Daleks in battle? If the Daleks, who were small in number, had controlled the casings from their base, they would have been able to subjugate the Earth and survive the SAS Daleks' arrival.

Likewise, when the SAS Daleks began attacking, the new Daleks could have easily used their same technology to teleport back out of their shells and evade extermination. For a race hell-bent on conquest and survival, these Daleks seemed out of their depths and easily thwarted, despite their new technological advantages.