Etno has constructed a time machine, but it also has a huge debt, owing the aliens 23 years of back taxes. Plus, if they do not pay up or fork over the money, the tax collectors Nefu Ganioni and Alex will confiscate everything in the house. They set the time machine to three different eras (the Stone Age, the Medieval Age, and the future), but there is no escape from the tax collectors. At the end, the tax collectors ring the aliens' doorbell and the aliens open the door to find all three versions of them, causing them to faint.
Les aliens voyagent dans le temps afin d'échapper aux impôts. Mais que l'on soit au temps des hommes de cavernes, au Moyen Âge, ou dans le futur, il faut bien les payer, ces impôts.
