Jessica Alba stars in this fourth film in the children's action adventure series. Teenage twins Rebecca (Rowan Blanchard) and Cecil (Mason Cook) have never got along with their stepmother Marissa (Alba) since she married their father, spy-hunting reporter Wilbur (Joel McHale). Unbeknown to the twins, however, Marissa is in fact a retired super-spy. When Earth comes under threat from the villainous Timekeeper (Jeremy Piven), Marissa is called back into action, and Rebecca and Cecil must put their resentments aside and assist her in protecting the future of the human race.