The TARDIS arrives in the year 2540 on board an Earth freighter which comes under attack. The crew seem to think that the Doctor and Jo, along with the other attackers, are Draconians - a reptilian race who are the major rivals to Earth's empire. The Doctor and Jo, however, can see that the attackers are really Ogrons - the ape-like heavies employed by the Daleks in "Day of the Daleks". The Doctor escapes and manages to get the two ambassadors away before being injured in the confusion. Jo helps him to the TARDIS as he sends a telepathic message to the Time Lords.