 Once Sarah Jane has analysed that the Bane ingredient was sentient , she activates her computer , Mr Smith - after some shouting by Kelsey - and contacts Wormwood and politely requests that she leaves Earth . Wormwood refuses , and in retaliation takes control of the majority of the human race . Sarah Jane races to the factory , but cannot enter until she drives the bus into a wall . Wormwood reveals the Bane Mother , and explains the Archetype is a conglomerate of human DNA designed to be investigated so that Bubble Shock could be improved . The Archetype uses an alien communicator Sarah Jane had been given , realising that the signal would be strong enough to kill the Bane Mother , and Sarah Jane , Maria , and the Archetype escape as the factory explodes . 
