A man awakens from a coma, only to discover that someone has taken on his identity and that no one, (not even his wife), believes him. With the help of a young woman, he sets out to prove who he is.
Julius Caesar plans on kidnapping Getafix but Asterix and Obelix save him. Whilst attempting to scatter the attackers, Obelix accidentally strikes Getafix with a menhir, the impact of which causes amnesia and forgets the recipe of the magic potion.