Meanwhile, Jo has fallen unconscious as a result of the plant sap and is removed from the spacecraft by a Spiridon, an invisible apparently humanoid lifeform. Whilst en route to the Thal spacecraft the Doctor and the Thals encounter an apparently disabled Dalek that has the power of invisibility. After briefly examining it they return to the Thal spacecraft to discover the Daleks have already found it. The Doctor, still believing that Jo is on board, reveals himself to the Daleks, only to be disabled and the spacecraft destroyed anyway.