The Miraculous Mellops 2 (1992)

The garden shop is having a reopening party and the kids decide to send a fax to the moonlings but when they get the number wrong they accidentally contact a race of aliens called Grubs who fly to planets and eat everything on them. Assisted by a young girl who lives in a black hole, and a window which can travel anywhere with a phone number. But as usual, Dump is still around to cause more mischief.