The Romans, desperate to uncover the secret of the Gauls superhuman strength, finally think they have cracked it. One Roman centurion who learns about that secret magic potion through a spy is especially eager to get hold of the recipe. He wants to use it to make himself invincible and remove all obstacles between himself and Caesar's throne. But Getafix, the shrewd village druid, cooks him up a very different potion. Our hero, Asterix, delivers it: an ancient, extremely powerful tonic that makes hair grow and grow.