Meanwhile, Sarah investigates the National Institute for Advanced Scientific Research, colloquially known as the "Think Tank". She finds that director Hilda Winters and her assistant Arnold Jellicoe are developing a robot, Experimental Prototype Robot K1, to be used to perform tasks in hazardous locations in place of humans. Sarah learns that K1 was originally built by Professor J.P. Kettlewell, a former member of the Think Tank who has now turned his sights on alternative energy. Kettlewell attests that he had disassembled K1 after finding its thought processes were growing too quickly, and further asserts that no one at Think Tank has the capacity to program it correctly, and that if they have tampered with its programming, the robot is likely suffering an existential crisis. Sarah expresses concern for the robot. Later, K1 appears at Kettlewell's residence and attempts to kill him, but when the Doctor, Sarah, and UNIT arrive, the robot becomes confused and escapes.