[3] Scientists and researchers in a base on the Moon discover living creatures encased in a seamless, perfectly round orb, which proves to be the repository of a benevolent alien intelligence that is fleeing tyranny in its own system.

The scientists offer the aliens sanctuary while they attempt to re-energize; and, in exchange, they begin to record their combined wisdom on the base's computers to preserve it before they are captured.

This act of compassion and sacrifice, in the face of almost certain death, is demonstrated as the Grippians self-destruct before they can be taken aboard the Tyrants' craft, thus denying them the knowledge they were so desperately seeking.

The Moon surface itself was a four inch deep layer of sand that had been dyed different colours to give the moonscape different gradations of tone when filmed in black and white.

The eyes of the Grippians were dressed-up ping pong balls held on sticks with added tendrils, and the models were filmed inside a water tank so that their 'hair' would drift about as they swayed and moved.