Pathfinders in Space is the sequel show to Target Luna and follows Professor Norman Wedgewood (now played by Peter Williams) and his team are planning another rocket mission to the Moon.
Once again, Geoff, Valerie and Jimmy (now played by Steward Guidotti, Gillian Ferguson and Richard Dean) are on hand to witness the launch of a new rocket MR1 (Moon Rocket 1), along with journalist friend Conway Henderson (now Gerald Flood). However, when the automatic supply ship MR2 (Moon Rocket 2) fails to launch Henderson and the children make a desperate rescue attempt with Jimmy’s pet Hamlet (now a guinea pig).
Henderson, Geoff and Jimmy (and Hamlet) set off in MR2, only to discover Valerie has stowed away. MR1 lands first with MR2 preparing to land via radio control. But on entry, MR2 nearly collides with an unknown object. Having landed safely, but a hundred miles off, the two parties set off to meet each other. On the way, Jimmy (and Hamlet) fall down a hole which turns out to be an airshaft that leads to a large cavern.
Inside, the MRI group discover an airlock, which leads them all to discover an alien craft. After the party of MR2 arrive, they discover the fossilized body of a man and find an ancient journal regarding the man was once part an alternative human, among others, who fled earth from a war only to die from lack of supplies on the Moon.
Elsewhere, meteors strike MR1 and the rocket explodes, meaning that only two members of the expedition of can leave in MR2. Then Wedgewood makes an attempt to fly the alien vessel. Eventually, the entire group return safely to earth.
Once back home, Wedgewood remarks “As man reaches out to towards the stars, who knows what he might find…”