Cow and Chicken - Season 1 - Eps 15: The Ugliest Weenie - Epilogue
Picking up where the last episode left off, the night the play begins, the cast and crew learn that Flem has been struck with chicken-pocks, so Chicken gets the role, while Cow is the new leading lady, since Wee Wee caught the pocks too. The play goes on, and all the weenies cast out the Ugliest Weenie, but soon learn that ugly is good, because it means that he won't get bar-b-qued, and eaten.
About Cow and Chicken

Title: Cow and Chicken
First Air Date: 1997-09-16
Last Air Date: 1999-08-13
Status: Ended
Rating: 7.1/10 (from 464 votes)
Language: EN
Seasons: 5
Total Episodes: 156
Network: Cartoon Network
Genres: Animation, Comedy, Kids
Production Companies: Hanna-Barbera Productions, Cartoon Network Studios, David Feiss Productions
Synopsis
Follows the surreal adventures of a cow, named Cow, and her chicken brother, named Chicken. They are often antagonized by "The Red Guy", who poses as various characters to scam them.
Cast

Charlie Adler
Cow / Chicken / The Red Guy / I.R. Baboon (voice)

Candi Milo
Mom (voice)

Dee Bradley Baker
Dad (voice)

Michael Dorn
I.M. Weasel (voice)