Enid Blyton's Enchanted Lands S01 E12 The Land of Wizards

The Land of Wizards. Joe, Fran and Beth arrive to find the Faraway Tree deserted. They learn that Red Goblins have imprisoned all their friends, demanding powerful spells and turning the Angry Pixie into a bucket of slime. The only hope is to get to the Land of Wizards, where there may be a Wizard who can help rid the Faraway Tree of the grotty Goblins.