Grebley Hemberdreck

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Grebley Hemberdreck is a character who is mentioned on Page 62 of The Book of Bill. In the bottom section, we can see a paragraph where Grebley Hemberdreck is calling for help from the reader, telling us that they are from Zimtrex 5, Bill has trapped their soul and also all the souls their entire race of people known as "Zimtrexians" and Bill keeps replaying the song "Good Vibrations" by Marky Mark and the Funky Bunch on an endless loop.

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V - E - H - D Characters and Creatures in Gravity Falls
Characters
Main	Bill Cipher \| Dipper Pines \| Gideon Gleeful \| Mabel Pines \| Stan Pines \| Ford Pines \| Soos Ramirez \| Wendy Corduroy
Supporting	Abuelita \| Agent Powers \| Agent Trigger \| Blendin Blandin \| Bud Gleeful \| Candy Chiu \| Deputy Durland \| Grenda Grendinator \| Lazy Susan \| Lee \| Manly Dan \| Nate \| Old Man McGucket \| Robbie Valentino \| Shandra Jimenez \| Pacifica Northwest \| Preston Northwest \| Priscilla Northwest \| Sheriff Blubs \| Sprott \| Tambry \| Tats \| Thompson \| Toby Determined \| Tyler Cutebiker
Minor	Alex Hirsch \| Anti-Mabel \| Ascot and Dickie Sibling \| Billy \| Blind Ivan \| Bobby Renzobbi \| Carla \| Carla McCorkle \| Caryn Pines \| Charlie (kid) \| Charlie (talk show host) \| Crampelter \| Davey \| Deuce \| Donna \| Doug \| Earl \| Emma Sue \| Emmet and D'Shawn \| Ergman Bratsman \| Fertilia Mecc \| Filbrick Pines \| Gabe Benson \| Gary \| Ghost-Eyes \| Gorney \| Grady Mecc \| Granny Sweetkin \| Greg and Janice Valentino \| Handlebar Bros. \| Hank \| Harry Claymore \| Jean-Luc \| Jeffy Fresh, Byrone, and Rosie \| Jimmy \| Jorge and Rico \| Justin Kerprank \| Killbone \| Lolph and Dundgren \| Corduroy Brothers \| Madeline Dixon \| Mariah \| Marius von Fundshauser \| Mayor Befufftlefumpter \| Melody \| Meredith \| Mikey R. \| Modoc the Wise \| Mr. and Mrs. Pines \| Mr. Poolcheck \| Mrs. Gleeful \| Nathaniel Northwest \| Nicolas \| Quentin Trembley \| Reggie \| Reginald \| Rich \| Rosanna \| Santiago \| Sassica \| Sergei \| Shmipper and Smabble \| Silas Birchtree \| Steve \| Stretch \| Sue \| Tad Strange \| Table Mabel \| Tate McGucket \| Thistle Downe \| Tyler's mother \| The Peaks Twins
Unnamed characters	America guy \| Angry lady \| Aquatic restaurant cook \| Bats Biker \| BeeblyBoop's clerk \| Billy's mother \| Bus Driver \| Charlie's mother \| Corn costume guy \| Corn maze girl \| Greasy's Diner cook \| Greasy's Diner shopkeeper \| Greasy's Diner waitress \| Hank's son \| Hank's wife \| Log Land girl \| Mattress King \| Mecc children \| Meredith's crush \| Mummy Kid \| Pacifica's Friends \| Pizza Guy \| Pool Jail kid \| Pop Pop \| Principal of Glass Shard Beach High School \| Prison Counselor \| Reggie's fiancée \| Soos' cousins \| Soldier Kid \| Summerween Superstore worker \| Unnamed bald biker \| Unnamed bandana lady \| Unnamed bearded fisherman \| Unnamed beautiful woman \| Unnamed big-chinned man \| Unnamed big-nosed man \| Unnamed biker \| Unnamed blonde boy in teal \| Unnamed blonde girl with pink bow \| Unnamed blonde man in pink \| Unnamed blonde woman in blue \| Unnamed blue sweatshirt woman \| Unnamed bouncer \| Unnamed boy in blue \| Unnamed boy in green \| Unnamed boy in teal \| Unnamed brown cap boy \| Unnamed brown vest fisherman \| Unnamed buck-toothed fisherman \| Unnamed buck-toothed girl \| Unnamed cat lady \| Unnamed chubby man in black \| Unnamed chubby boy in blue \| Unnamed workman \| Unnamed cook \| Unnamed dispatcher \| Unnamed doctor \| Unnamed elderly man \| Unnamed fanny pack man \| Unnamed fanny pack woman \| Unnamed fisherman with glasses \| Unnamed football players \| Unnamed girl in blue \| Unnamed girl in light blue dress \| Unnamed girl in pink \| Unnamed girl in skirt \| Unnamed girl with a ponytail in pink \| Unnamed girl with a ponytail in purple \| Unnamed girl with glasses \| Unnamed girl with purple sweater \| Unnamed goth \| Unnamed gray mustache man \| Unnamed hiker \| Unnamed hillbilly \| Unnamed lawyer \| Unnamed librarian \| Unnamed "Lil' Stanley" fan \| Unnamed lumberjack \| Unnamed mailman \| Unnamed man in black \| Unnamed man in blue \| Unnamed man in blue shirt \| Unnamed man in blue vest \| Unnamed man in brown \| Unnamed man in cat sweater \| Unnamed man in green \| Unnamed man in pink \| Unnamed man in red \| Unnamed man in white \| Unnamed miner \| Unnamed mother and baby \| Unnamed mustache man in red \| Unnamed news anchor \| Unnamed Northwest butler \| Unnamed old man with a white visor \| Unnamed old woman in pink \| Unnamed old woman in purple \| Unnamed pigtailed girl \| Unnamed pointed nosed woman \| Unnamed propeller cap boy \| Unnamed puffy haired boy \| Unnamed purple cap boy \| Unnamed red cap man \| Unnamed red vested woman \| Unnamed rich man \| Unnamed rich son \| Unnamed scout lady \| Unnamed singing hippie \| Unnamed soul patch man in blue \| Unnamed soul patch man in green \| Unnamed sweaty man \| Unnamed taxi driver \| Unnamed ticket seller \| Unnamed traveler \| Unnamed turtle guy \| Unnamed veteran \| Unnamed woman in blue \| Unnamed woman in blue overalls \| Unnamed woman in green \| Unnamed woman in orange \| Unnamed woman in overalls \| Unnamed woman in purple \| Unnamed woman in teal \| Unnamed woman in yellow \| Unnamed workman \| Upside-Down Town boss \| Woodpecker guy \| Unnamed man with Briefcase \| Unnamed blonde character
Groups	Discount Auto Mart Warriors \| Football players \| Globnar Tributes \| Tourists \| Pioneers \| Real people \| Unseen characters \| Alternate Universe Versions of Mabel
Animals	Cheekums \| Donald, Sandy, and Mr. Cat Face \| Gompers \| List of animals \| Northwests' dog \| Waddles
Creatures
Species and groups	Arachnimorphs \| Creatures of Weirdmageddon \| Cursed Egyptian super termites \| Dinosaurs \| Dipper clones \| Disembodied hands \| Eye-Bats \| Fairies \| Floating Eyeballs \| Flying skulls \| Geodites \| Ghosts \| Giant Vampire Bats \| Gnomes \| Leprecorns \| Lilliputtians \| List of creatures \| Little green men \| Mabeland inhabitants \| Manotaurs \| Merpeople \| Pan-dimensional beings \| Plaidypuses \| Snadger \| The Undead \| Unicorns \| Wax figures
Resident creatures	Archibald Corduroy \| Baby pterodactyl \| Bat Boy \| Big Henry \| Bigfoot \| Bumblebeast \| Candy monster \| Celestabellebethabelle \| Chutzpar \| Cooler monster \| Cycloptopus \| Franz \| Giant eyeball \| .GIFfany \| Gobblewonker \| Gremloblin \| Gremularth \| Hide Behind \| Island Head Beast \| Leaderaur \| Lilliputtian head knight \| Lilliputtian pirate captain \| Limby Jimmy \| Ma and Pa Duskerton \| Mr. What's-His-Face \| Multi-Bear \| Octavia \| Paper Jam Dipper \| Polly \| Pterodactyl \| Rumble McSkirmish \| Sev'ral Timez \| Shape Shifter \| Sister Mary Hilda Miley \| Steve \| Summerween Trickster \| Tentacle Monster \| Thing 26 \| Tracey and Quattro \| Tyrone
Non-resident creatures	The Axolotl \| Chamelius Pendraggin \| Darlene \| Jersey Devil \| Kraken \| Love God \| Mermando \| The Oracle \| Purple Spy \| Queen of the Manatees \| Sarcasti-Pup \| Space lizard \| Grebley Hemberdreck
Fantasy creatures	Aoshima \| British dog man \| Centaurtaur \| Clay monsters \| Dippy Fresh \| Ernesto \| Flavor Pups \| Footbot \| Griffin \| Hand Witch \| Hot Elf \| Impossibeast \| Judge Kitty Kitty Meow Meow Face-Shwartstein \| Ogres \| Probabilitor the Annoying \| Shimmery Twinkleheart \| Stuffed Animal Tree \| Waffle Guards \| Xyler and Craz \| Scrimbles
Creatures from the future	Cyclocks \| Time Baby
Creatures from the Nightmare Realm	8 Ball \| Amorphous Shape \| Bill Cipher \| Creature with 88 different faces \| C-3-lhu \| Giant Ear \| Hand Monstrosity \| Hectorgon \| The Horrifying Sweaty One-Armed Monstrosity \| Keyhole \| Kryptos \| Lava Lamp \| Paci-Fire \| Purple spider with arms in his mouth \| Pyronica \| Teeth \| Zanthar
Sentient objects	Cursed Doors \| Mailbox \| Tumbleweed Terror