GrandPat travels through alternate dimensions and timelines to get home.
| Actor | Role |
|---|---|
 Tom KennySpongeBob / SpongeBot / Gary / Robo-Gary / French Narrator | SpongeBob / SpongeBot / Gary / Robo-Gary / French Narrator |
 Bill FagerbakkePatrick / Pat-Tron | Patrick / Pat-Tron |
 Rodger BumpassSquidward / SquidBot / Captain Doug Quasar / Demon | Squidward / SquidBot / Captain Doug Quasar / Demon |
 Clancy BrownMr. Krabs / RoboKrabs | Mr. Krabs / RoboKrabs |
 Mr. LawrencePlankton / PlankBot / Rube / Rubedor / Robo-Larry | Plankton / PlankBot / Rube / Rubedor / Robo-Larry |
 Jill TalleyKaren / Squidina Star | Karen / Squidina Star |
 Carolyn LawrenceSandy Cheeks / Sandroid | Sandy Cheeks / Sandroid |
 Lori AlanPearl | Pearl |
 Thomas F. WilsonCecil Star | Cecil Star |
 Cree SummerBunny Star | Bunny Star |
 Dana SnyderGrandPat Star | GrandPat Star |
 Patrick PinneyPainty the Pirate | Painty the Pirate |