Searcher is called back to Earth, which is surprising because they just recently left there, having stopped for supplies. Even more surprisingly, Buck is singled out to appear in the hangar deck. And everyone is stunned when Buck is placed under arrest for treason, which has a mandatory sentence of death. It turns out that evidence has been uncovered linking Buck to the Holocaust which destroyed much of 20th century Earth.
He is shown a video tape of a high ranking military official explaining that it is just a matter of time until a nuclear strike wipes everything out, and it can all be traced back to a group of conspirators which included him. Unfortunately, he doesn't remember any of this. Dr. Goodfellow thinks it's understandable that he doesn't understand, since shortly afterwards he was frozen for 500 years, but that doesn't help them now. So they decide to use a device which will dig directly into Buck's memories, whether he remembers having them or not, and project them so that everyone can see. After the trial reconvenes, Buck is hooked up to the device, and the first image everyone sees is Mount Rushmore. This confuses Buck, as he has never even visited there. The next image really incriminates Buck, as it shows him getting final instructions from a fellow conspirator, and seems to prove beyond a shadow of a doubt that he's guilty. As they continue delving into Buck's memories, we see him receiving espionage equipment including a camera and a device which will allow him to break into safes, and later we see him actually using these devices to break into a military base. Buck's memories have at this point seemingly convicted him.
As the trial recesses, Buck talks with Wilma and Hawk, and he's still confused at how he doesn't remember any of these events. Plus he keeps getting flashes of Mount Rushmore, and Hawk suspects that the device is bringing buried memories to the surface. Unfortunately, the Admiral brings word that the trial is effectively over, since there is already more than enough evidence to convict Buck. Seeing no other options, Buck and Wilma decide to return to Earth, specifically to Mount Rushmore, to find out what's going on. After they take off they are almost immediately tailed by a guard who orders them to return, but Hawk swoops in with his ship and neutralizes him.
After Buck and Wilma land, they meet with a guide who tells them about a secret presidential bunker inside Mount Rushmore. It turns out that it was built out of fears of a nuclear strike, but when the Holocaust came the president never had a chance to get there. Buck and Wilma explore the area, and Buck again sees flashes of memories he didn't even know he had. Unfortunately, the guards have caught up with them, and bring them back to Searcher. Once there, they manage to convince the Commission which is trying Buck to let him use the device one last time, either to completely incriminate him, or bring out the truth. This time he remembers a meeting with the president, in which he was asked to infiltrate the group of conspirators in order to bring them down. Buck agreed to the mission, but was worried that he wouldn't be able to convince them, and they explain to him that they can put him under a very deep hypnosis so that he will truly believe he's a radical conspirator, therefore convincing the group completely, and that he also won't remember a thing about it, for his own safety, as well as for national security. Seeing that Buck was a hero after all, all charges against him are dropped, and unfortunately the events surrounding the Holocaust will probably stay a mystery forever.