The TARDIS arrives on present day Earth where the Doctor and Ace investigate a distress signal, only to discover knights from another dimension led by the evil sorceress Morgaine and her son Mordred have arrived in our dimension to seek out Excalibur, the mythical sword of power of the legendary King Arthur. The Doctor is mistaken for Merlin, and the Doctor believes Merlin may be his future incarnation. Reuniting with Brigadier Lethbridge Stewart, The Doctor, Ace, a young Chinese woman named Shou Yuing, U.N.I.T officer Brigadier Winifred Bambara and a knight named Ancelyn set out to stop Morgaine and her knights unleashing the demonic Destroyer of the Worlds and prevent Morgaine and Mordred from destroying the planet with a nuclear warhead that U.N.I.T is transporting across the countryside. Written by
Did You Know?
During filming of a sequence in "Battlefield" where Ace is trapped in a water tank, actress Sophie Aldred
suffered minor cuts when the glass front to the tank cracked. Further problems were caused as the water flooded the studio floor and electrocution was barely avoided. See more
He has many names, but in my reckoning, he is Merlin.
Do you recognize my face then?
No, it is not your aspect, but your manner that betrays you. Do you not ride the ship of time? Does it not deceive the senses by being larger within than without? Come, Merlin, cease these games.