Waking Nightmare (The Grim Adventures of Billy & Mandy)

"Waking Nightmare" is the first half of the sixth episode in the sixth season of The Grim Adventures of Billy & Mandy.

Plot
When Mandy finds Billy playing with Grim's gigantic dog, Cerberus, she forces Grim to keep Billy under tight control because she needs a good night of sleep to be ready for the next day's test. With a little persuasion from his own dad, Billy tries to wake up Mandy at night, so she will fail the test and he can score higher than her for the first time.

Why It's a Waking Nightmare

 * 1) As always, Billy here is unlikable and dumb as he throws Cerberus, Grim's giant dog's ball, into Mandy's window and annoys her, and then tries to wake her up in the middle of the night even though she said she's having a test the next morning.
 * 2) The monster thing as seen in the title card above also looks messed up, along with Mandy's bed having faces.
 * 3) Harold is randomly shoehorned in just to tell Billy that if he passes the test, he will give him a new computer game.
 * 4) Billy pumping out pimples and then bursting when thinking hard is a bit disturbing, along with the face he makes when Mandy says that their test is today at school.
 * 5) Grim baking a delicious cake and pestering the yoga guy to eat it seemed random and served as filler.
 * 6) Out of nowhere plot twist where it turns out that the Mandy that was sleeping was actually Irwin in disguise with the real Mandy was actually sleeping in her dog's doghouse. It never actually explained why Irwin put a Mandy costume on him or about Mandy sleeping in Saliva's doghouse. The plot twist was just randomly done at the wrong time.
 * 7) *As such, this basically means that Grim literary stayed up nearly all night/keeping Billy from waking up Mandy for nothing.
 * 8) Random ending: After Billy and Mandy get their test results, Billy, in a snark tone, says that he's gonna get Grim to change his exam from an F to an A, to which Mandy says otherwise, and it is revealed that Irwin stays over at Mandy's house to serenade Grim for a week, as per Mandy's orders, with Irwin telling Grim that it's not wise to upset Mandy. Then, Irwin plays his saxophone while Grim groans in agony. This also shows that Grim is being punish for something that he technically succeeded in.

Redeeming Qualities

 * 1) Grim is still a tolerable character.
 * 2) There are some funny moments, such as the WoopyCusson scene.
 * 3) Billy does get his comeuppance a few times here.