Vince Deadrick Sr.

After two teens are found murdered, the investigation leads Don and his team to uncover a dangerous counterfeit money ring. Charlie is called in to use his mathematical expertise to pinpoint the location of the counterfeiters by analyzing the dispersion of the bogus money. In the process, he also discovers a surprising connection to the disappearance of a local artist. Meanwhile, Charlie realizes how little he knows about his brother when he meets someone from Don’s romantic past.

After attacking an outpost, Romulans battle the Enterprise.

When a recent murder bears a strong resemblance to a murder case he closed a year ago, Don questions whether he sent the wrong man to jail. As a favor to Don, Charlie examines the old case and finds flaws in the fingerprint and eyewitness systems that put their reliability into question.

Viewers are introduced to Nurse Christine Chapel in this story as she signs aboard the crew to search for her missing fiance, the brilliant Dr. Korby. He turns up on Exo III, oddly working on a plan to create android duplicates of key figures, beginning with James Kirk — until the captain sabotages his duplicate to alert Spock.

The crew discovers a paradise controlled by computer.