|The Greatest Love Story Ever Told Ever|
|Series||The Grim Adventures of Billy & Mandy|
|Writer||C. H. Greenblatt|
|Cartoon Network US Premiere||April 6, 2007|
|Paired with||Detention X|
Beware of the Undertoad
The school is hosting a Valentine's dance, and Irwin plans to invite Mandy and creates an elaborate hand-made card for her. However, he doesn't have the nerve to deliver it to her personally, so he asks Nergal Jr. to deliver it for him. Nergal Jr. waits outside Mandy's house to deliver the card, but Mandy believes the card is from him. Before Nergal Jr. can explain, Mandy accepts "his" proposal, upsetting Irwin. Despite Nergal Jr. and Irwin falling out, Nergal Jr. escorts Mandy to the dance later that week. At the dance, Nergal Jr. becomes over-protective of Mandy and confronts every other boy at the dance, accusing them of "looking" at Mandy. Billy and Irwin are also at the dance, and whilst Nergal Jr. is getting some punch Irwin walks up to Mandy and asks her to dance with him. At that moment Nergal Jr. returns and argues with Irwin again. Nergal Jr. throws his punch at Irwin (and misses), with Irwin retaliating and throwing punch back at him. The dance descends into a "punch fight", and afterwards Mandy reveals that she only accepted Nergal Jr's proposal to make Irwin jealous and cause both boys to fight over her and wreck the dance, because in Mandy's words, "if I can't enjoy Valentine's Day, then no-one can". Mandy leaves, and Nergal Jr. says "so, this is love". Irwin and Nergal Jr. forgive each other, and the episode ends with them dancing together in the empty hall.
- Story and Storyboard by: C. H. Greenblatt
- Directed by: Kris Sherwood and Gordon Kent
- The pair of Indian twins Billy and Irwin end up going with are a reference to Ron Weaseley and Harry Potter's Yule Ball dates, Parvati Patil and Padma Patil in Harry Potter and the Goblet of Fire.
- Sperg melting when punch is dumped on him is a reference to The Wizard of Oz, when the Wicked Witch of the West melts after water is dumped on her.
- A living pitcher of punch resembles the Kood-Aid Man.