It's Christmas time, and when Gantu accidentally sends Experiment 267 (Wishy-Washy) instead of Experiment 297 (Shortstuff), Stitch decides to use Wishy-Washy's ability to grant people's wishes to raise up his good deed counter. However, Yuna wants to get something for Gramma, but she tells her she doesn't need to get her anything. When Penny kicks Ted out of her entourage, he wishes he could ruin Penny's Christmas party and Wishy-Washy accidentally turns her Christmas tree into a monster, and with no more wishes left, Stitch and the others must save Penny.

Dads Day celebrations are coming up at school, but Yuna believes that her father, who is still away and busy with his research on sea slugs, will not show up. Stitch arranges to have Yuna's father arrive on the island and meets him on his ship. Meanwhile, Hämsterviel decides to use a climate-changing machine under the water near the island to cause a powerful storm so that he and Gantu can steal the Spiritual Stone unopposed. Discovering Hämsterviel's machine, Yuna's father and Stitch take a submarine to destroy the machine and save the ocean. In the end, Yuna finally reunites with her father, just in time for Dads Day.