Season 6

Billy & Mandy: Wrath of the Spider Queen

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Underfist: Halloween Bash

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67 :06x01 - Dumb-Dumbs and Dragons/Fear and Loathing in Endsville

Dumb-Dumbs and Dragons: Billy wants to prove that he is a hero, so Boss Del Guapo teaches him how by making him do his chores. Now that he has done the training, Billy tries to find the weaknesses of Killdozer, the dragon that Billy is supposed to slay while teaching Killdozer the "Billy Style." In the process, he becomes friends with Killdozer, however he still has to slay him. Will he slay Killdozer?
Fear and Loathing in Endsville: Dracula drives to a local diner with Grim for an early bird special, but he gets them stuck in a desert. How will they get out of the desert and make it to the diner?

68 :06x02 - Dad Day Afternoon/Scary Poppins

Dad Day Afternoon: Grim's father thinks he's a country singer, however Grim is not one anymore. Grim wants to tell him the truth, but he is scared, so Billy and Mandy try to help.
Scary Poppins: Mandy's parents can't stand Mandy anymore, so they hire a nanny to teach her good manners, but will she succeed?

69 :06x03 - Hurter Monkey/Goodbling and the Hip-Hop-Opotamus

Hurter Monkey: Billy and Mandy want a monkey butler named Dickie Galoot from a T.V. show. Grim zaps the T.V. with his scythe to prove that Dickie can't do better at chores than Grim, but proves him wrong. Grim wants to leave, however he cannot or else he'll go to the Underworld Jail. He tries to get rid of Dickie in cleaning contest. Who will win?
Goodbling and the Hip-Hop-Opotamus: Principal Goodvibes turns into a hip-hop rapper by a blast from Grim's scythe.

70 :06x04 - Spidermandy/Be A-Fred, Be Very A-Fred

Spidermandy: Mandy gets the chicken pox from Jeff.
Be A-Fred, Be Very A-Fred: Grim becomes a "spokesmonster" for a high-profile company.
Guest Stars: C.H. Greenblatt as Fred Fredburger
Director: Sue Perrotto

71 :06x05 - The Crass Unicorn/Billy and Mandy Begins

The Crass Unicorn: Billy wants to go to a magical place where everything is positive, so Grim takes him to the Enchanted Forest. Most things are peaceful except a rude unicorn named Mary Frances. Billy tries to change her.
Billy and Mandy Begins: Irwin asks Billy, Mandy, and Grim how they met.
Guest Stars: Grey Griffin as Unicorn Mom | Steve Blum as Cereal

72 :06x06 - The Secret Snake Club vs. P.E/King Tooten Pooten

The Secret Snake Club vs. P.E.: Several of the kids in school, including Billy and Erwin want to get out of P.E., and so they enlist the help of the Secret Snake Club.

King Tooten Pooten: Irwin learns about his heritage, and he was related to a pharoah named "King Tooten Pooten". Then King Tooten Pooten comes back in the night, to try and convince Erwin to be king. Will he succeed?
Guest Stars: Tom Kenny as Wiggly

73 :06x07 - Billy Gets an "A"/Yeti or Not, Here I Come

The unthinkable happens, and Grim and Mandy must clean it up; Grim discovers that he forgot to reap the abominable snowman.

74 :06x08 - Nergal's Pizza/Hey, Water You Doing?

A shape-shifting monster loves pizza; a lovesick mermaid falls in love with an idiot.

75 :06x09 - Company Halt/Anger Mismanagement

General Skarr is lured back to the dark side; Mandy, Grim and Skarr get help to control their tempers.
Guest Stars: Armin Shimerman as Mr. Skarr

78 :06x12 - Billy and Mandy Moon the Moon

Billy, Mandy and Grim must preserve Earth's dairy stock after they are kidnapped by aliens obsessed with cheese.

80 :06x14 - Nigel Planter and the Order of the Peanuts

Billy, Mandy and Grim must preserve Earth's dairy stock after they are kidnapped by aliens obsessed with cheese.

81 :06x15 - El dia de los Muertos Stupidos/Heartburn

El dia de los Muertos Stupidos: TBA

Heartburn: When toying with Grim's "true heart camera", Billy takes photos of himself, Mandy, and Irwin. Upon examining the photos, Mandy is shocked to discover something Irwin has been concealing from her, and when confronted, he reveals a dark secret that threatens to radically change Mandy's heart...