A series of lightning superstorm strikes around Los Angeles reunites two troubled child stars who are the couples of a once prestigious climate scientist. One of them suspects her father is behind it and upon further investigation, they discover that all of her father's comrades are dead - victims of lightning superstorm strikes. Soon their suspicions are confirmed as her father hijacks radio and TV transmissions to relay the message that unless a certain Mayor who canceled his acting career contracts is handed over, the city of Los Angeles will suffer the consequences. As the child stars race to form a plan that can defeat her father, he lets loose a variety of diabolical weather weapons on the Hollywood Sign, Capitol Records Tower and Hollywood Bowl, and Downtown Los Angeles.
Kirk Cameron as Mike Seaver, a recently released convict and child star, Ricky's brother.
Soleil Moon Frye as Penelope “Punky” Brewster, a soldier returning to her family.
Todd Bridges as Willis Jackson, the scientist of Los Angeles.
Ian Ziering as Richard "Ricky" Seaver, student and older brother of Mike.
Ashton Kutcher as Leopold "Leo" Brewster, husband to Punky and father of Chloe.
Francesca Capaldi as Chloe Brewster, daughter of Punky and Leo Brewster.
Tina Yothers as Jennifer Keaton, child star of The Seavers.
Cassie Scerbo as Jessica Goldberg, love interest of Ricky, angering her boyfriend, Data.
Jonathan Ke Quan as Richard “Data” Wang, Jessica's boyfriend who bullies Ricky.
Sean Astin as Mikey, one of Data's friends
Jeff Cohen as Chunk, one of Data's friends
Bruce Hornsby as George Clinton, Mayor of Los Angeles.
Shannon Elizabeth as Carrie Keaton, a waitress married to Agent Steven Keaton
Meredith Baxter as Elyse Keaton, a mother searching for her daughter and husband
Michael Gross as Agent Steven Keaton, Carrie's husband