Mr Sprott's assistant Tracy has designs a small robot, called Tom - Talk Operated Machine.
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A Mouse is loose in the factory. Bertha is making Jack-in-the-boxes but several are faulty and Roy and Tom have to chase the springing jacks around the factory floor.
Mr Duncan, the works foreman, does a Time and Motion study and comes up with conclusive proof that Bertha should be replaced.
Miss McClackerty, discovers that today is in fact, Bertha's birthday! Bertha is oiled, polished and spruced up and given the day off by the Manager.
Mr Sprott and Tracy design a new toy to be made on another machine but they keep falling apart. Good old reliable Bertha is brought to the rescue.