When King Arthur and his knights are taken captive, Merlin travels to the future for their replacements.

Lance and Trunk are captured by Morgana, and Arthur travels to her castle to rescue them.

The wizard Merlin recruits help from the future.

The knights face Lord Viper and the Warlords while questing for a magic key that can free King Arthur from the Cave of Glass.

After a failed attack on Camelot, Lord Viper captures a unicorn for Morgana's plot to gain dominion over animals.

The magician Cryslin requests Arthur's help in freeing a sorcerer named Rigis from a sea serpent.