Sarah Jane and the gang face the most dangerous day of their lives as the rhino-like Judoon return. When prisoner Androvax the Annihilator crash-lands on Earth, the Veil is set free to turn Earth's technology against itself. His next intended victim is Sarah Jane. As the Judoon fleet approaches Earth, it's a race against time to stop Androvax. With Genetec Systems' technology on the rampage and Rani's parents taken prisoner, can anything stop the Army of the Infinitesimal?