Mungo and the Spiders from Space

Mungo was enjoying his book "Galacticus and Gizmo Save the Universe". The hero, Captain Galacticus, had been captured by the Dr Frankenstinker and things didn't look good. Mungo couldn't wait to find out what happened next, but when he turned over, the last page was missing. Who would foil Dr Frankenstinker's plan? Who would save the universe now?