Transmitted originally: 27 January 1973 to 12 February 1973.
They have run into trouble, however, as the bureaucratic Minorians are unhappy with their credentials. The Doctor's efforts to rescue Jo from the scope, which is on the point of breaking down, are hampered by the schemes of two Minorians, Kalik and Orum, who plan to trick their superior, Pletrac, and overthrow the planet's president, Zarb, by allowing the Drashigs to escape. Vorg destroys the Drashigs with an eradicator weapon, and the Doctor, linking the scope to the TARDIS, is able to return all the exhibits to their points of origin. Jo materialises beside the wrecked device, and she and the Docotr leave in the TARDIS.
Ian Marter, later cast as the Fourth Doctor's companion, Harry Sullivan, plays John Andrews.  
A Cyberman makes a cameo appearance as one of the exhibits in the Miniscope.
    
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