Following Cassius Ceramix's challenge, Asterix and Vitalstatistix attempt to restore Getafix's mind by experimenting in potions; but this produces only a whimsical sub-plot, in which the Roman soldier Infirmofpurpus, captured by Obelix as a test subject, is temporarily rendered weightless. Thereafter Asterix and Obelix consult Psychoanalytix (original French name is "Amnesix"), a druid who specializes in mental disorders; but when asked to demonstrate what caused the problem, Obelix crushes Psychoanalytix with a menhir, leaving him "in the same state as Getafix". As the two crazed druids concoct a number of skin-coloring potions, Asterix tries to get Vitalstatistix into good physical shape for the fight, mainly by jogging. Meanwhile, the Romans plan to arrest Ceramix after the fight, lest he thereafter challenge their control of Gaul.