1x1 – Folge 1
In "Meet the Reaper", Billy and Mandy, two neighbor kids, play a game with the Grim Reaper for the soul of a sick hamster. In "Skeletons In the Water Closet", Billy's overprotective mom discovers the Grim Reaper sleeping in her son's room and panic ensues, particularly when Billy's dad doesn't see Grim and is convinced that his wife has cracked.
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1x2 – Folge 2
In "Opposite Day", Grim's patience and sanity are put to the test during a holiday where everything means the reverse of what it normally does. In "Look Alive!", when they turn down Grim's being hired as a swimsuit model, Billy and Mandy try to help by giving him a makeover.
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1x3 – Folge 3
Grim teaches Billy how to take control of someone else's body. Billy, unfortunately, makes the mistake of trying his new skill out on Mandy.
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1x4 – Folge 4
When a supernatural creature kidnaps Billy and Mandy, Grim must decide if he'd rather rescue his "Friends" or just relax in a lawn chair.
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1x5 – Folge 5
After Billy eats all the cookies the kids are supposed to be selling,Grim saves the day with his Great Aunt's secret recipe. But some recipes should be kept secret.
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1x6 – Folge 6
Billy and Mandy discover that Grim's mother is a genie. Mandy is soon in control of the only remaining wish, with Grim and Billy desperately trying to curry favor.
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1x7 – Folge 7
Billy and Grim mistakenly deduce that Mandy is a cannibal and has eaten everyone in the neighborhood! Billy decides to confront Mandy before she eats him! Billy's mom returns, bent on taking vengeance on Grim.
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1x8 – Folge 8
Nergal returns, trying to win friends using a giant carnival. Billy takes up his cause, revealing to Nergal the five C's of friendship.
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1x9 – Grim Surprise, A/Everybody Loves Uncle Bob/Beasts and Barbarians
Billy and Irwin are addicted to the video game "Beasts and Barbarians", inspiring Mandy and Grim to visit another dimension to give Billy and Irwin a taste of "the real thing".
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1x10 – Hoss Delgado: Spectral Exterminator/Evil on Trial/To Eris Human
Grim must evade extermination at the hands of Hoss Delgado, Spectral Exterminator!
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1x11 – Billy's Growth Spurt/Time Hole Incident/Billy and the Bully
Billy gets a small growth on his back which turns into an evil pint-sized Billy! Can Mandy and Grim get rid of it before it terrorizes the neighborhood?
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1x12 – Big Trouble in Billy's Basement/Christmas Con Carne/Tickle Me Mandy
In "Big Trouble in Billy's Basement" Billy steals Grim's "bad book" and starts an apocalypse, which Mandy, Grim, and Hoss Delgado must stop. In "Tickle Me Mandy" Mandy goes away for a day, so Grim makes Billy a new Mandy to play with.
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1x13 – Little Rock of Horrors/The Pie Who Loved Me/Dream a Little Dream
Billy befriends a giant brain-eating meteor in his backyard. Grim, Billy and Mandy eat some bad pizza, resulting in a series of bizarre and mind-bending dreams.
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