I have a cake for a 4 year old little that LOVES the movie "Bedtime Stories", the PBS show "Sid the Science KId", and "the Cat in the Hat". Any ideas on how to tie these elements together? I am drawing a blank.

TIA

WELL! Just the first thought to pop into my head here...could easily have no merit.

I would make a cat in the hat, tophat. Then grab a theme from one of the stories IN "bedtime stories" and make Sid the character playing out the theme. Placing the theme, and Sid on top of the hat

What about Sid and the Cat (or the fish) standing under a shower of gumballs? You could do that with a two-tier round. Top tier could be blue, bottom green. Have Sid and the cat standing on the bottom tier and the gumballs "flowing" down the top tier.