This might be a tricky one but I'll do my best. It's an American or British produced mid-90's TV show about teens aboard a spaceship facing different challenges every episode. I remember one particular episode that had a cute alien grow into a hungry and evil monster as an adult. The adult monster was a man in a suit similar to Chewbacca but with a huge wide mouth, shark like teeth and two hairy cones atop of its head sort of like horns. One of the teens threw an apple or a ball into its mouth and it just ate it.
One of the features of the spaceship interior was that it had tunnel slides that the teens would use to quickly reach lower levels.
I also remember the main/credits soundtrack which is impossible to write down but it has that creepy "haunted house" synth music effect similar to the classic old Dr Who episode credis in the 60s or 70s. Any ideas? It's not hypernauts, Deep water, AJs time travelers or space cases.
UPDATE: So thanks to the research by FuzzyBoots it turned out to be Space Cases despite my initial thought that it wasn't.