Mandy lives a boring life in El Pasito until her rebellious grandfather Brad suddenly appears to surprise his daughter Rubí with a thunderous arrival.

Mandy, Rubí and Brad camp in the town hall's garden. When Mandy and Brad try to sneak out a rat bites Rubí complicating the night

Mandy is excited to go to the ExtremePalooza but Rubí asks her to sing in the girls' choir. Brad will come up with a plan to attend both events.

Brad gets trapped inside his messy shed. Mandy and Rubí must rescue him by going through the bizarre and gloomy labyrinth that has formed.

Mandy wakes up disoriented with no memory of her birthday celebration, but little by little she ties up the loose ends and remembers what happened.