Eight years after the third film, the OSS has become the world's top spy agency, while the Spy Kids department has since become defunct. A retired spy Marissa is thrown back into the action along with her stepchildren when a maniacal Timekeeper attempts to take over the world. In order to save the world, Rebecca and Cecil must team up with their hated stepmother. Carmen and Juni have since also grown up and will provide gadgets to them.

Raised by her father, an ex-CIA agent, in the wilds of Finland, Hanna's upbringing has been geared to making her the perfect assassin. Sent into the world by her father on a mission, Hanna journeys across Europe, eluding agents dispatched after her by a ruthless intelligence operative. As she nears her ultimate target, Hanna faces startling revelations about her existence.

Fiona is the manager of a fast-food restaurant. She lives comfortably with her family in the suburbs. In other words, Fiona is happy... until one day she accidentally gets locked into a walk-in fridge. She escapes the next morning, half frozen and barely alive, only to realize that her husband and two children didn't even notice she was missing. But when Fiona develops an obsession for everything cold and icy: snow, polar bears, fridges, icebergs--she drops everything, climbs into a frozen goods delivery truck and leaves home. For a real iceberg.

Secrets, rumors and betrayals surround the upcoming marriage between a young dissolute man and virtuous woman of the French aristocracy.