ALIENS IN MY GARDEN takes ALDITHA the witch and HARPER (the talking, though not terribly bright owl) from their usual business serving the residents of the Garden on a path that pits them against SKOROS. The would-be evil wizard is useless at magic, great at engineering, has a brass wand, a smart alec who plans to take over the Garden. When a giant teacup lands in their world, they are introduced to CELESTE, a teenaged alien girl (who s really much older than she looks) and ALPHA, her bio-mechanoid co-pilot, who looks like a typical Grey alien.