Cow and Chicken - Season 2 - Eps 29: Who's Afraid of the Dark?
Mom and Dad are upset that Cow and Chicken aren't afraid of the dark, so they call in a specialist on fear: The Red Guy (who portrays Dr. Lackslacks). He tries everyway he can to make Cow and Chicken afraid, only succeeding in making himself afraid of everything.
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)