Billy in Bubble Trouble

Billy is a Florbz and the favourite pet of Space Princess Leila. He is a happy little critter as he gets snacks regularly and the occasional tummy rub to ensure he feels like he is in Paradise. But one day he woke up and his food bowl was empty.... no snacks.... and no tummy rubbing anymore! Why? After a daunting 6 hours it hit him (Florbz are not known for their quick wit and intelligence) and the huge writing on the wall saying "WE HAVE KIDNAPPED THE PRINCESS" also might have given it away, who knows?