Eight months after their escape from the hive, Arthur and the city of Camelot are mercilessly attacked by the advanced forces of the Mori-Gran-Ra. With their defences lacking, Merlin reveals a discovery he's made within the Hive's mainframe, one that could turn the tide against the Mori. Now Arthur and his team must travel to a frozen alien world, where their only hope lies in a race of aliens that have the power to defeat the Mori Armada. But they may find that the price of an alliance is more than they are able to pay.