The Grim Adventures of Billy & Mandy The Most Greatest Love Story Ever Told Ever/Detention X (2001–2007) Online
- Original Title :
- The Most Greatest Love Story Ever Told Ever/Detention X
- Genre :
- TV Episode / Animation / Comedy / Family / Fantasy / Horror
- Year :
- 2001–2007
- Directror :
- Juli Murphy,Shaun Cashman
- Cast :
- Grey Griffin,Greg Eagles,Richard Steven Horvitz
- Writer :
- Maxwell Atoms,C.H. Greenblatt
- Type :
- TV Episode
- Time :
- 22min
- Rating :
- 8.0/10
In "The Most Greatest Love Story Ever Told Ever" Nergal Jr. accidentally asks Mandy to the Valentine Day dance, making Irwin jealous. In "Detention X" Grim becomes a substitute teacher and sends all the kids into the Detention Dimension.
| Episode complete credited cast: | |||
 | Grey Griffin | - | Mandy / Boy #2 (voice) (as Grey DeLisle) |
 | Greg Eagles | - | Grim (voice) |
 | Richard Steven Horvitz | - | Billy (voice) (as Richard Horvitz) |
 | Vanessa Marshall | - | Irwin / Girl / Mandy's Mom (voice) |
 | Steve Blum | - | Crazy Papoo / Leperchan Lad (voice) |
 | Jane Carr | - | Pud'n (voice) |
 | Chris Cox | - | Principal Goodvibes / Juice Man / Sick Man (voice) |
 | Debi Derryberry | - | Nergal Jr. (voice) |
 | Jennifer Hale | - | Date Girl #1 & #2 / Boy (voice) |
 | Martin Jarvis | - | Nergal (voice) |
 | Renee Raudman | - | Ms. Butterbean (voice) |
 | April Winchell | - | Mr. Slither / Kid (voice) |
In the scene where Nergal Junior and Irwin get in a punch throwing contest, Kool-Aid Man (the mascot for Kool-Aid brand flavored drink mix), makes an appearance.
The incantation Mandy recites at the blackboard is loosely based on a small portion of the lyric to the 1953 James 'Sugar Boy' Crawford song, "Jock-A-Mo"; also known as "Iko Iko" by The Dixie Cups (1965). The historically litigious nature of the song might explain why it's misspelled, mispronounced and more well disguised than most cultural references written into this show.
The music for the Valentine's Day Dance played during the credits is a cleverly disguised tribute to the song "Billie Jean" (1982), by Michael Jackson.