SEASON 1 GUEST STAR(S)
001. Revenge of the Swamp Monster! Chris Paul
002. A Mystery Solving Gang Divided! Abraham Lincoln
003. Peebles’ Pet Shop of Terrible Terrors! Wanda Sykes
004. Elementary, My Dear Shaggy! Sherlock Holmes
005. Ollie Ollie In-come Free! Ricky Gervais
006. The Scooby of a Thousand Faces! Wonder Woman
007. The Cursed Cabinet of Professor Madds Markson! Penn & Teller
008. When Urkel-Bots Go Bad! Steve Urkel
009. The Fastest Fast Food Fiend! Jim Gaffigan
010. Attack of the Weird Al-Losaurus! “Weird Al” Yankovic
011. Now You Sia, Now You Don’t! Sia
012. Quit Clowning! Kenan Thompson
013. What a Night, for a Dark Knight! Batman
SEASON 2 GUEST STAR(S)
014. The Nightmare Ghost of Psychic U! Whoopi Goldberg
015. The Sword, the Fox, and the Scooby-Doo! Mark Hamill
016. One Minute Mysteries! Flash (Berry Allen)
017. Hollywood Knights! George Takei
018. The New York Underground! Halsey
019. Fear of the Fire Beast! Steve Buscemi
020. Too Many Dummies! Jeff Dunham & Darci Lynne Farmer
021. Dance Matron of Mayhem! Maddie Ziegler
022. The Wedding Witch of Wainsly Hall! Jeff Foxworthy
023. A Run Cycle Through Time! Malcolm McDowell
024. I Put a Hex on You! The Hex Girls
025. The High School Wolfman’s Musical Lament! Christian Slater
026. Space Station Scooby! Neil deGrass Tyson & Bill Nye
SEASON 2 GUEST STAR(S)
027. The Phantom, The Talking Dog, and the Hot Hot Hot Sauce! Kacey Musgraves
028. The Last Inmate! Morgan Freeman
029. The Horrible Haunted Hospital of Dr. Phineas Phrag! Kristen Schaal
030. The Hot Dog Dog! Joey Chestnut
031. A Moveable Mystery! Gigi Hadid
032. The Feast of Dr. Frankenfooder! Alton Brown
033. A Fashion Nightmare! Tim Gunn
034. Scooby on Ice! Tara Lipinski
035. Caveman on the Half Pipe! Chloe Kim
036. The Crown Jewel of Boxing! Laila Ali
037. The Internet on Haunted House Hill! Liza Koshy
038. The 7th Inning Scare! Macklemore
039. The Dreaded Remake of Jekyll & Hyde! Sandy Duncan
040. Total Jeopardy! Alex Trebek (+ Johnny Gilbert)
041. Dark Diner of Route 66! Axl Rose
042. Lost Soles of Jungle River! Jason Sudeikis
043. The Tao of Scoob! Lucy Liu
044. Returning of the Key Ring! Sean Astin
045. Cher, Scooby and the Sargasso Sea! Cher
046. The Lost Mines of Kilimanjaro Jessica Biel
047. The Legend of the Gold Microphone Joseph Simmons (Run-DMC)
048. Scooby-Doo and the Sky Town Cool School! Billy Dee Williams
049. Falling Star Man! Terry Bradshaw
050. A Haunt of a Thousand Voices! Frank Welker, Grey Griffin, Matthew Lillard and Kate Micucci
051. Scooby-Doo, Dog Wonder Blue Falcon and Dynomutt
052. The Movieland Monsters! Carol Burnett
001. Revenge of the Swamp Monster! Chris Paul
002. A Mystery Solving Gang Divided! Abraham Lincoln
003. Peebles’ Pet Shop of Terrible Terrors! Wanda Sykes
004. Elementary, My Dear Shaggy! Sherlock Holmes
005. Ollie Ollie In-come Free! Ricky Gervais
006. The Scooby of a Thousand Faces! Wonder Woman
007. The Cursed Cabinet of Professor Madds Markson! Penn & Teller
008. When Urkel-Bots Go Bad! Steve Urkel
009. The Fastest Fast Food Fiend! Jim Gaffigan
010. Attack of the Weird Al-Losaurus! “Weird Al” Yankovic
011. Now You Sia, Now You Don’t! Sia
012. Quit Clowning! Kenan Thompson
013. What a Night, for a Dark Knight! Batman
SEASON 2 GUEST STAR(S)
014. The Nightmare Ghost of Psychic U! Whoopi Goldberg
015. The Sword, the Fox, and the Scooby-Doo! Mark Hamill
016. One Minute Mysteries! Flash (Berry Allen)
017. Hollywood Knights! George Takei
018. The New York Underground! Halsey
019. Fear of the Fire Beast! Steve Buscemi
020. Too Many Dummies! Jeff Dunham & Darci Lynne Farmer
021. Dance Matron of Mayhem! Maddie Ziegler
022. The Wedding Witch of Wainsly Hall! Jeff Foxworthy
023. A Run Cycle Through Time! Malcolm McDowell
024. I Put a Hex on You! The Hex Girls
025. The High School Wolfman’s Musical Lament! Christian Slater
026. Space Station Scooby! Neil deGrass Tyson & Bill Nye
SEASON 2 GUEST STAR(S)
027. The Phantom, The Talking Dog, and the Hot Hot Hot Sauce! Kacey Musgraves
028. The Last Inmate! Morgan Freeman
029. The Horrible Haunted Hospital of Dr. Phineas Phrag! Kristen Schaal
030. The Hot Dog Dog! Joey Chestnut
031. A Moveable Mystery! Gigi Hadid
032. The Feast of Dr. Frankenfooder! Alton Brown
033. A Fashion Nightmare! Tim Gunn
034. Scooby on Ice! Tara Lipinski
035. Caveman on the Half Pipe! Chloe Kim
036. The Crown Jewel of Boxing! Laila Ali
037. The Internet on Haunted House Hill! Liza Koshy
038. The 7th Inning Scare! Macklemore
039. The Dreaded Remake of Jekyll & Hyde! Sandy Duncan
040. Total Jeopardy! Alex Trebek (+ Johnny Gilbert)
041. Dark Diner of Route 66! Axl Rose
042. Lost Soles of Jungle River! Jason Sudeikis
043. The Tao of Scoob! Lucy Liu
044. Returning of the Key Ring! Sean Astin
045. Cher, Scooby and the Sargasso Sea! Cher
046. The Lost Mines of Kilimanjaro Jessica Biel
047. The Legend of the Gold Microphone Joseph Simmons (Run-DMC)
048. Scooby-Doo and the Sky Town Cool School! Billy Dee Williams
049. Falling Star Man! Terry Bradshaw
050. A Haunt of a Thousand Voices! Frank Welker, Grey Griffin, Matthew Lillard and Kate Micucci
051. Scooby-Doo, Dog Wonder Blue Falcon and Dynomutt
052. The Movieland Monsters! Carol Burnett