A baby in a carrycot left on Sarah Jane's doorstep almost as if she came from the sky leads to an apt name for this mysterious child.
Though she may seem harmless, this child is an
alien bio weapon created by Miss Myers to save her people. Once in contact with
the Metalkind, the weapon is primed and becomes a teenage girl; Sky, emitting
an electrical pulse affecting items which carry a charge.
When Myers was taken by the
Metalkind, Sky is now no longer a danger and is welcomed by Sarah Jane as her
new foster daughter.