Hector and Aunt Diana are expecting a visit from Hector's cousin Julian, but Diana's grandmother Anna, known to everyone in the family as Disaster Anna, appears instead. Short-sighted and almost deaf, she has the demeanor of an old sergeant, which naturally creates tension. She's up to some nonsense. Among other things, she gives Marsu her famous "energy drink" to drink, which causes Marsu to rage through the jungle like a wisp. Hector and Diana believe that Marsu must be captured before anything worse happens, but capturing a Marsu is nearly impossible.