A teenage savant—who was found disoriented in the middle of traffic and has no recollection of his past—is taken in by the Trager family.
Kyle gets on the bad side of both Trager kids, Josh and Lori, and annoys Stephen, Nicole's husband. However, 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, the Tragers subjects him to running, sleeping pills and other activities. Josh suspects that Kyle may be an alien.
The police discover a skeleton near the spot where Kyle was discovered. Meanwhile, Kyle is confused by the varying levels of lies people tell each other.
Kyle attempts to understand his emotions and sudden attraction to his next door neighbor, Amanda.
Kyle, Lori and Josh experience difficulties on the first day of school, and Nicole and Stephen receive a visit from Tom Foss.
Kyle becomes frustrated when he experiences his first flashes of memory. Also, it's Lori's birthday but she's not excited about it.
Kyle links his memory to a missing professor, but he finds a welcome distraction after joining the school 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. Kyle accompanies Lori and Declan to the University of Washington to search for clues about 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. With Declan in tow, Kyle uses his newfound abilities to investigate Tom Foss.
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, Stephen has trouble accepting that Kyle may be leaving.