Retribution (The Sky Man)

Whilst on an unnamed planet, The Master sent out Cole to be it's saviour. However, in doing so, he accidently created Robot Suits that went rogue.

Originally, the suits were used to keep the villagers of the planet alive, as they were dying due to the fallout of the Last Great Time War. However, when all the villagers managed to fit in one suit, it became it's own creature and tried to take out the Master and Cole, in a need for revenge. The Master and Cole fleed in their TARDIS before the suit managed to damage them.