The first of SpongeBob’s family to foray into time was Squidward, whose accidental cryofreeze took him two millennia into the future. Of course, even primitive sponges know that that was not actual time travel, but future-SpongeTrons point the six-limbed cephalopod to a time machine that took him on two actual time travel trips before returning him to his own time. No, we don’t know whether one of the future SpongeTrons is SB-129, but we do note that the production code for this episode was 2515-129.

SpongeBob, Patrick, and their two superhero friends head back to the days when the old superheroes were young. Can you guess who it was back in that past who ate all of Mermaid Man’s tartar sauce, unintentionally altering the future? Note: The old superheroes were voiced by Ernest Borgnine and Tim Conway; their young counterparts were Adam West and Burt Ward.

This episode has implied time travel in that we see a tartar-sauce sated Patrick licking his lips and burping after young Mermaid Man and Barnacle Boy discover that their barrel of quick-dry tartar sauce is empty (as also happened in “Back to the Past”).

SpongeBob and faithful Patrick use the boxy time machine from “SB-129” to travel back and give advice to their younger selves.

In the first of three time travel mini-episodes—each around one minute long—SpongeBob and Patrick put their hot tub time machine through the works, hoping to find Mermaid Man and Barnacle Boy in their prime.