A teenager is found disoriented in the middle of traffic and taken to a detention facility. Later, Nicole Trager, a psychologist, comes to examine him, and takes him home. He gets on the bad side of both Trager kids, Josh and Lori, and annoys Stephen, Nicole's husband. But one by one, Kyle influences them to accept him.

Kyle encounters the concept of time and wonders why those around him focus on it. In an attempt to tire out Kyle, his family subjects him to running, sleeping pills and other activities. Josh suspects that Kyle may be an alien.

Kyle attempts to figure his emotions and sudden attraction to next door neighbor Amanda, while Lori and Josh are also experiencing love pains of their own.

Kyle, Lori and Josh experience difficulties on the first day of school while Nicole and Stephen receive a visit from Tom Foss.

Kyle becomes frustrated when he experiences his first brief flashes of memory, and he ultimately finds comfort from Amanda. It's the day of Lori's birthday, but she's not excited about it while Kyle on the other hand, wishes he even knew the date of his birthday.

Kyle links his memory to a missing professor, but finds a welcome distraction when he joins the basketball team. Meanwhile, Nicole gains a better understanding of Kyle's unique situation.

After an unusual hypnosis session, Kyle is determined to unlock his memory, so he accompanies Lori and Declan to the University of Washington to search for clues about the missing Professor Kern and how his relationship ties in with Kyle.

Kyle discovers that he has the ability to read lips and listen to distant conversations, so he recruits Declan and uses the newfound abilities to investigate Tom Foss. Meanwhile, Josh stresses over his grades. Amanda's boyfriend has a terrible secret.

The Petersons, Kyle's real parents, arrive to take him home, but Kyle is skeptical about his biological ties, so he turns to Tom Foss for answers. Meanwhile, Steven has trouble accepting that Kyle may be leaving.