No good can come of Ataru and Ten switching bodies, nor using Lum’s shortcut to get to school on time.

Shinobu, Lum, and Ataru take an unexpected trip to the future. The good news is they discover who their spouses are. The bad news is their disappointment is immeasurable.

The trio are determined to find their ideal futures, but each one they find leave them unsatisfied. And Inaba’s coworkers are not happy with the group’s meddling.

Inaba returns and has an important question for Shinobu.

What started as a misunderstanding ends in a falling out. Now Lum refuses to return until Ataru apologizes.

With the fate of the Earth on the line again, Lum and Ataru’s last game of tag begins.