When the Venusian cave man (Bob Bryan) finds Henderson (Gerald Flood), Mary (Pamela Barney) and the kids in his cave, Henderson scares him away by shining his flashlight in his eyes.  Everyone moves deeper into the cave.  Geoff (Stewart Guidotti) and Margaret (Hester Cameron) get separated from Henderson and Mary. 

Brown (George Coulouris) manages to find Wilson (Graydon Gould) who was unhurt from his fall through the crevasse.  At the same time Geoff and Margaret, still holding Hamlet the guinea pig, manage to get separated again.  Margaret manages to find Brown and Wilson.  Brown pretends that he didn’t know Margaret made it out alive when their rocket crashed.  Margaret sets things straight and tells Wilson that Brown lied.  Brown is forced to admit all his lies.  Brown again lies and says he will lead them out of the caves and back to the ship.  Instead he leads them further into the mountain and to the volcano at the heart of it.

As Brown is, once again, double crossing everyone, Geoff is found by Henderson and Mary.  They run across a small band of cavemen that seem to be hatching a plan.  They decide to follow them believing that they may be looking for Margaret.  Henderson’s suspicion is proven when they interrupt the cave men attacking Wilson.  Wilson tells Henderson, Mary and Geoff that Brown and Margaret went across a narrow ledge around the volcano to get away from the cave men.  Everyone else has no choice but to follow.   

When a small quake sends down some of the cave, Brown gets trapped underneath and Margaret gets cut off from the others.  Just then a Venusian child (Brigid Skemp) appears and motions for Margaret to follow her. 

The action in “Pathfinders to Venus” is fast and furious.  There are a lot of cliffhanger type moments in scene after scene.  This results in quite a few gaffs in dialogue or props or just in missteps in the technical aspects of the series.  When someone walks through the back of the set or a giant boulder wiggles when it shouldn’t, you kinda have just go with the flow.  Writers Malcolm Hulke and Eric Paice have given up all pretense of science fact in their scripts and are now in full blown fantasy.  Venus is the perfect place to indulge in these whims of plot development.