King Arthur learns one of his knights is plotting to take over and marry his daughter. Following the King's death, the Knight wishing to marry the princess is ordered by the great wizard Merlin to remove the sword from the scabbard and prove his right to the throne.
| Actor | Role |
|---|---|
 Janette ScottPrincess Katherine | Princess Katherine |
 Ronald HowardEdmund of Cornwall | Edmund of Cornwall |
 Mark DignamKing Arthur | King Arthur |
 John LaurieMerlin | Merlin |
 Jerome WillisThe Limping Man | The Limping Man |
 John GabrielEarl of Chatham | Earl of Chatham |
 Ronald LewisRobert Marshall | Robert Marshall |
 Francis de WolffThe Blacksmith | The Blacksmith |
| VVictor HarringtonSir Guy | Sir Guy |
 Peter MasonYoung Monk | Young Monk |