Knightmare Series 4 was formed of 16 episodes. It was shown on Friday afternoons from 7 September - 21 December 1990.
- Teams: 8
- Winning Quests: Team 6 (Crown)
- Longest Quest: Team 6 (54 mins)
- Shortest Quest: Team 7 (25 mins)
- Pickle, the elf
- Brother Mace, the Tavern Monk
- Gundrada, the Sword Mistress
- Malice, the Sorceress
- Fatilla the Hun
- Mistress Goody, the Witch
- Oakley, the Tree Troll
- The Boatman
- Weeping Doors (Dooris, Doorkis, Dooreen)
- An assistant for Treguard, Pickle the elf.
- The Eye Shield enable pre-recorded links between scenes.
- New theme music and modified titles.
- Use of real locations combined with computer graphics.
- Assassins and redesigned skulls introduced.