"The Belchies" is the premiere episode in Season 2, being the fourteenth episode overall.
Teddy tells a story of hidden treasure inside an abandoned taffy factory that is about to be demolished, so the kids decide to sneak out and look for the treasure. Meanwhile, Bob and Linda have a scheduled sex night and Linda attempts to make it special by having games and sneaking Bob an enlargement pill.
When Teddy tells a story of treasure inside an abandoned taffy factory, the kids take his treasure map and go on a quest to find the treasure. On the way there, Jimmy Jr. follows them as Tina invited him, resulting with Jimmy Jr.'s plus one invites of his wrestling buddy, Zeke, and the Pesto twins. Louise gets annoyed at her siblings for letting this happen, so she attempts to find the treasure and falls into one of the booby traps that was set up to keep seekers from finding the treasure.
Bob and Linda Belcher have a scheduled sex night, and Linda tries to make it interesting by adding games to their sex, but it goes wrong when they roll the dice many times and get nothing romantic to do. Soon, Linda finds that the kids have gone missing and reads Tina's diary to find out where they went. Bob and Linda go to the taffy factory to find them, but the demolition starts while they run out of time. They find Louise in the trap and Tina saves her life when she snaps out of her "stupid girl" mood from getting Jimmy Jr. closer to her.
In the end, it reveals that there was treasure, and it was inside the taffy figure that Louise found. The credits end with the song "Taffy Butt", sung by Cyndi Lauper in an homage to "The Goonies 'R' Good Enough" from the 1985 movie "The Goonies".