The Invincible's failed rescue on Regis III
The cruiser Invincible lands on the desert planet Regis III to learn why its sister ship, the Condor, went silent, and finds the Condor's crew dead with their memories wiped, reduced to infant-like helplessness. The attacker is a black cloud of tiny insect-like machines whose magnetic pulses erase human memory. The ship's giant antimatter-armed robot, the Cyclops, is overwhelmed, and the navigator Rohan walks into the swarm's territory alone, masking his own brain activity so the swarm ignores him, to recover the missing men before the ship withdraws.