Sir Droopalot and Sir Butchalot (Droopy and Butch) vie with each other to kill a dragon that is terrorizing their kingdom. Whomever vanquishes the dragon will marry the king's daughter.
Unfortunately the movie One Droopy Knight is not yet available on HBO Max.
| Production | William Hanna | Producer |
| Production | Joseph Barbera | Producer |
| Sound | Scott Bradley | Music |
| Art | Fernando Montealegre | Background Designer |
| Directing | Michael Lah | Director |
| Editing | Jim Faris | Editor |
| Writing | Homer Brightman | Story |
