Dr. Ramzi becomes aware of an unusual trio of youngsters with superhuman powers, painting graffiti on walls in their native London streets. Noora, Cat and Hadya investigate. Unknown to them, the streetwise triplets' powers come not from a Noor stone but from a far more sinister source. At the same time Sphinx is planning a daring heist at the British Museum, aided by a team that includes Hammerforce, Savage and Razors Edge. The 99 attempt to thwart Sphinx's plan, but the super-villains are rescued from the skies by an unexpected ally.