Once in A Blue Moon

Tired of the Gargoyles destroying their homes, the Fairies of Fairy Glen ask the bumbling Wizard McShoogle for help. Armed with a potion and a few jumbled words, they banish the Gargoyles until the moon turns blue. And what's the chance of that happening? Present day - Ben age 7 and Megan age 9 think the moon looks blue! When their grandmother unexpectedly arrives in Aberdeen the next day, they discover she's a Witch. Can they stop Russel and his ghastly Gargoyles taking over Aberdeen - before the moon is full?