Weng-Chiang has stolen the time cabinet from Litefoot's house, so the Doctor and Leela go to try and stop him from using it. They find an opium-drugged Chang. Jago teams up with Litefoot for their own investigation.
Weng-Chiang has stolen Professor Litefoot's cabinet but is not pleased when his men leave the key behind and later cannot find it. Leela and the Doctor go off to find the missing key while Jago and the professor follow Weng-Chiang's men and find themselves in the den of the scorpion.—garykmcd