Nikki and Jack go looking for aliens.
(Continues tomorrow at 5.10pm)
This week's episodes written by Brian B Thompson and Michael Ennis
(Repeat) (Subtitled)
Followed by Rewind: 1969: One Small Step
The story of American astronaut Neil Armstrong's historic first steps on the moon. seen through the eyes of his 12-year-old son Rick.
(Repeated tomorrow morning on BBC2)