No overcat but there was a cat character. Riffraff, Shoeshine, changing in the phone booth, talking in rhyme, Simon Barsinister and of couse Polly were all there. Oh yes, and the humans did say "Look! in the sky, it's a bird, it's a plane, it's a frog....It's Underdog!" These are the things that made me laugh, and Jim Belushi was in it, he is always entertaining.
If you have no child to bring with you to see it, then catch it on DVD later, you'll like it.