the opening theme with different celebrities congratulating him. As the song finishes, Patrick asks SpongeBob how old he is, just to be interrupted by static. Cast Voices Tom Kenny as SpongeBob SquarePants, Old Man Walker, Gary, French Narrator, SpongeBob's Dad, Peter Lorre Fish, Grubby Grouper Bill Fagerbakke as Patrick Star, Bus Passenger, Passenger, Patron #1 Rodger Bumpass as Squidward Tentacles, Bus Passenger, Announcer, Yellow Fish Clancy Brown as Eugene Krabs, Unhappy Guy, Party Guest #2 Carolyn Lawrence as Sandy Cheeks, Bus Passenger, Little Girl Mr. Lawrence as Sheldon Plankton, Potty the Parrot, Rube, Larry, Fred Jill Talley as Karen, Office Middle Management Lori Alan as Pearl Dee Bradley Baker as Bubble Bass, Dog, Alarm Clock, Cow Mary Jo Catlett as Mrs. Puff Sirena Irwin as SpongeBob's Mom, Gawky Female, The Kid Frank Caeti as Gorilla Boss Ephraim López as Monkey Middle Manager Cory DeMeyers as Monkey Middle Manager Lana McKissack as Monkey Middle Manager Sydney Olson as Monkey Middle Manager Live-action cast Tom Kenny as Patchy the Pirate, JimBob Bill Fagerbakke as Patrick Rodger Bumpass as Manward Clancy Brown as Mr. Slabs Carolyn Lawrence as Carol Mr. Lawrence as Charleston Jill Talley as Office Middle Management Lori Alan as Pet Shop Woman Dee Bradley Baker as Bald Guy Sirena Irwin as Office Worker David Hasselhoff as himself Kel Mitchell as Beans McBeans, himself Dahlya Glick as Can Jack Griffo as Contestant Daniella Perkins as Contestant JoJo Siwa as herself Tiffany Haddish as herself Thomas F. Wilson as Dog Walker, Himself Sigourney Weaver as herself Heidi Klum as herself Kal Penn as himself Lana Condor as herself (original airings) John Goodman as himself (alternate airings) Jason Sudeikis as himself RuPaul as himself Vernon Davis as himself Rob Gronkowski as himself Ethan Slater as himself Danny Skinner as himself Lilli Cooper as herself Gilbert Gottfried as himself Broadcast and reception Viewership SpongeBob's Big Birthday Blowout premiered on July 12, 2019, simultaneously across Nickelodeon, and Nicktoons. The three-network premiere was collectively viewed by 2.2 million people in the United States, and it posted year-to-year gains for the network across multiple demographics, most notably, kids ages 2–11 (3.3/797K, +57%). The special's premiere date is notable for taking place five days before the 20th anniversary of the series' official premiere, which took place on July 17, 1999. It aired in other territories on July 12 and July 13, 2019, Tom Kenny's 57th birthday. Reception Verne