Sky: Part 2

Plot:

Sarah Jane discovers that Sky is actually a bomb disguised as a child. She has been manufactured by Miss Myers whose planet is in a long-standing war with a rival planet occupied by robots and is the ultimate weapon of destruction. At the power station Sarah Jane keeps Miss Myers talking long enough for Rani and Clyde to close down the plant and defuse Sky,who is prepared to sacrifice herself to save the world. Will they succeed?