From the review:
"The premise of Heathcliff! The Fast & The Furriest is strange at best. Aliens have to our planet and decided that they need to experiment on cats because they look just like them, so they have kidnapped Heathcliff’s girlfriend Sonja. Upon hearing Heathcliff’s objection, the aliens offer to return Sonja if he can best them in a series of races. You know, because that somehow makes more sense than simply flying away. Yeah, I don’t really get it either. Personally, I don’t see the need for a story at all and I think it would’ve been better without one, but maybe that’s just me."