Again, Again, And Again... Gawayn : Season 1 Episode 23

The Questers finally reach the end of their quest and are about to take the crystal of Gawain, only to find themselves starting over again and again. William is the only one who understands they're repeating everything and realizes an evil Wizard, Bob Bob, (who repeats everything twice) hexed them. William must find Bob Bob and make time return to normal!