I remember seeing this episode once
when I was a kid. It's been stuck in the back of my mind ever since, and I finally look it up after all these years.
It's the episode where CatDog get stuck in a "Mean Bob" movie and have to rescue an alien princess.
Go to 9:55 for the build-up. The kissing is direct, but there's no effect. I can't make one up either.
I don't know about you, but I found this pretty hot.