1. Ernest Borgnine and Tim Conway as Mermaid Man and Barnacle Boy
Ernest Borgnine and Tim Conway's iconic roles as Mermaid Man and Barnacle Boy top our list. Their dynamic duo, filled with comedic charm and superhero antics, became an integral part of SpongeBob's world, leaving an indelible mark on the series.
2. David Bowie as Lord Royal Highness
The legendary David Bowie graced Bikini Bottom with his presence as His appearance in "Atlantis SquarePantis" brought sophistication and musicality to the underwater adventure, leaving fans in awe.
3. Celebrities as Themselves
SpongeBob's 10th-anniversary special featured a star-studded lineup, including Rosario Dawson, Triumph the Insult Comic Dog, LeBron James, Tina Fey, Will Ferrell, Eddie Deason, Craig Ferguson, Robin Williams, and Pink. This unforgettable ensemble celebrated the show's enduring popularity.
4. John Goodman as Santa Claus
John Goodman's portrayal of Santa Claus in the stop-motion holiday special "It's a SpongeBob Christmas!" brought festive cheer to Bikini Bottom. His presence in the underwater world added a touch of holiday magic that even Plankton couldn't resist.
5. Amy Poehler as Granny
Amy Poehler's dual portrayal of Granny showcased her comedic talent. While initially appearing as a sweet, elderly figure, Granny's dark side added a unique twist to the episode "Gary Takes a Bath."
6. J.K. Simmons as Maestro Mackerel
J.K. Simmons, known for his role in "Whiplash," lent his voice to the Maestro Mackerel character. His strict yet comical conduct as a musical director in "Krabby Road" provided a perfect parody of the intense music teacher archetype.
7. Andy Samberg as Colonel Carper
Andy Samberg's portrayal of Colonel Carper, the band manager, added a touch of hilarity to the episode "Whirly Brains." His energetic and eccentric character injected life into SpongeBob and Squidward's musical journey.
8. Betty White as Beatrice
Betty White's portrayal of Beatrice, the kind-hearted elderly fish, added a layer of wisdom and warmth to the episode "Mall Girl Pearl." Her character taught valuable life lessons and stood up to bullies, reminding us that age is just a number.
9. Mark Hamill as The Moth
Mark Hamill brought his legendary charm to the role of The Moth. This character's brief but memorable appearance showcased Hamill's knack for adding depth to even the most unusual characters.
10. Brian Doyle Murray as The Flying Dutchman
Brian Doyle Murray's recurring role as The Flying Dutchman solidified him as one of the show's most iconic antagonists. His ghostly antics provided the perfect foil to SpongeBob's eternal optimism.
11. Kristen Wiig as Hagfish Grandma
Kristen Wiig's transformation into Hagfish Grandma was both sweet and sinister. Her portrayal in "Have You Seen This Snail?" showcased her incredible range as an actor and added depth to the episode's plot.
12. R. Lee Ermey as Prison Warden
R. Lee Ermey, known for his iconic drill instructor role in "Full Metal Jacket," flexed his authoritative muscles as the prison warden in "The Inmates of Summer." His no-nonsense approach to handling SpongeBob and Patrick's antics was both amusing and intimidating.
13. Bob Barker as Bob Barnacle
Bob Barker's appearance as Bob Barnacle showcased his passion for animal rights. His heartfelt message about spaying and neutering pets in "The Two Faces of Squidward" highlighted the importance of responsible pet ownership.
14. Pat Morita as Master Udon
Pat Morita, the Karate Kid himself, brought a twist to his martial arts expertise as Master Udon. While initially appearing as a Sensei, Morita's character took an unexpected turn, reminding us that appearances can be deceiving.
15. Johnny Knoxville as Johnny Krill
Extreme sports meet Bikini Bottom in Johnny Knoxville's hilarious portrayal of Johnny Krill. His daring stunts and the DraStic Radicals brought a refreshing wave of action to the underwater world.
Johnny Depp's larger-than-life presence graced the SpongeBob universe as the enigmatic Jack Kahuna Laguna. His character's mysterious surfing legend status made for a memorable encounter, proving that even in Bikini Bottom, legends are born.
17. John O'Hurley as King Neptune
John O'Hurley's charismatic voice lent itself perfectly to the character of King Neptune. His pompous yet entertaining portrayal in various episodes captured the essence of royalty under the sea.
18. Gene Simmons and Shannon Tweed as Sea Monster and Mom Fish
KISS frontman Gene Simmons and his wife Shannon Tweed added their unique flair to the underwater world. Simmons' sea monster character brought a dose of rock 'n' roll, while Tweed's Mom Fish showed us that maternal instincts run deep, even in Bikini Bottom.
19. Henry Winkler as Sharkface
From the Fonz to a hammerhead shark, Henry Winkler's versatility shone through in "Sharks vs. Pods." This unexpected turn as Sharkface gave us a fresh perspective on the actor, reminding us that appearances can be deceiving, even under the sea.
20. Marion Ross as Grandma SquarePants
Marion Ross, best known for her role in "Happy Days," made waves as Grandma SquarePants. Her portrayal of SpongeBob's loving grandmother in "Grandma's Kisses" showcased her incredible talent. This heartwarming character added depth to SpongeBob's family dynamics, proving that age is no barrier to love.
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