Phineas and Ferb travel across the galaxy to rescue their older sister Candace, who has been abducted by aliens and taken to a utopia in a far-off planet, free of her pesky little brothers.

Home with their newly-formed family, happy parents Dan and Jody are haunted by sinister, paranormal activities. Determined to expel the insidious force, they install security cameras and discover their family is being stalked by an evil dead demon.