The spelling you're looking for is Mystic Knights of Tir Na Nog
Power Rangers is in a league of its own IMO, so I won't put it in a list of series, but in a list of bad to worst...
1. VR Troopers
2. Masked Rider
3. Beetleborgs Metallix
4. TMNJ: The Next Mutation
5. Mystic Knights of Tir Na Nog