Alan Bennion

The planet Peladon is hoping to join the Galactic Federation. But King Peladon’s Chancellor has been murdered and it seems that the legendary royal beast, Aggedor is to blame.

The work of the committee is hampered by sabotage, fear and suspicion. The Doctor knows the Ice Warriors of old and believes that they may be the guilty party.

The Doctor is sentenced to a fight to the death in the pit with the King's champion, Grun. But the saboteur and killer is still at large.

Hepesh, supported by the delegate from Arcturus, is revealed to be behind the attacks. Arcturus is killed but Hepesh escapes to rouse a rebellion against the King.

Returning to the Moonbase, the Doctor confronts Slaar and the remaining Ice Warriors and must find a way of deflecting the invasion fleet that is heading towards them.

With the commerce of the world grinding to a halt, the Doctor, Jamie and Zoe agree to investigate and set off for the Moon in an old fashioned rocket.