The Grim Adventures of Billy and Mandy - Season 3 Episode 19
Trying to get revenge at Mandy for bossing them all the time, Billy and Grim put her in the "Mask of the Beast". Mandy must be nice and friendly while wearing the mask, or else she will become a hideous monster. Failing to remove the mask herself, and struggling to be kind to Billy and Grim, Mandy gradually turns into the beast. Billy and Grim ask Mandy to smile while she gives them a sponge bath, but this turns out to be too hard for Mandy. She fully transforms into the beast and punishes them instead.
First Air Date : 2001-08-24
Last Air date : 2007-11-09
Runtime : 57 minutes
Genre : Animation, Comedy, Kids
Cast : Greg Eagles, Richard Steven Horvitz, Grey DeLisle, Vanessa Marshall
Crew : Brian A. Miller (Executive Producer), Gregory Hinde (Music), Drew Neumann (Music), Jay Bastian (Executive Producer)
Quality : 
Subtitles :
- Season 3 : Episode 12004-06-11
- Season 3 : Episode 22004-06-11
- Season 3 : Episode 32004-06-18
- Season 3 : Episode 42004-06-18
- Season 3 : Episode 52004-06-25
- Season 3 : Episode 62004-06-25
- Season 3 : Episode 72004-07-02
- Season 3 : Episode 82004-07-02
- Season 3 : Episode 92004-07-02
- Season 3 : Episode 102004-07-09
- Season 3 : Episode 112004-07-09
- Season 3 : Episode 122004-07-16
- Season 3 : Episode 132004-07-16
- Season 3 : Episode 142004-07-23
- Season 3 : Episode 152004-07-23
- Season 3 : Episode 162004-07-30
- Season 3 : Episode 172004-07-30
- Season 3 : Episode 182004-08-01
- Season 3 : Episode 192004-08-01
- Season 3 : Episode 202004-08-08
- Season 3 : Episode 212004-08-08
- Season 3 : Episode 222004-10-15
- Season 3 : Episode 232004-10-15
- Season 3 : Episode 242004-10-22
- Season 3 : Episode 252004-10-29
- Season 3 : Episode 262004-10-29
- Season 3 : Episode 272004-11-05
- Season 3 : Episode 282004-11-05
- Season 3 : Episode 292004-11-12
- Season 3 : Episode 302004-11-12
- Season 3 : Episode 312004-11-26
- Season 3 : Episode 322004-11-26
