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Double helix
Double helix 2
Double helix 3

A geneticist, Dr Martin Nodel, is a researcher looking into introns, mysterious sections of DNA that he believes hold the secret to future evolution. He develops a formula that he believes will activate them, and tests it on himself. After developing the liquid that acts on the intron (genetic material in DNA that acts as spacers and does not code for protein) he tests the liquid on himself. He begins experiencing strange symptoms, including a sort of map that grows on his back and a pattern that grows on his hand. Shortly after he begins looking for students that are suitable candidates. They have to have a high IQ, never had surgery, and are free from imperfections such as tattoos or glasses. They also have to be in a certain age, weight, and height range. After finding the needed candidates, he reveals the map. The area is discovered to be a hidden military area not on any normal map and, along with Nodel's son and his girlfriend, the group travels to the area. Inside that area, is a spaceship-type device, with symbols matching the ones on the Doctor's hands. It activates, and a message from an apparent alien race is played back. The Doctor, and the students, decide to enter the ship on a journey to the home planet. Despite his son and son's girlfriend not qualifying, the Doctor says that they'd need someone like the two of them. The ship takes off.

The story concludes in episode 23 of season 4, "The Origin of Species".

Cast

Ron Rifkin ... Dr. Martin Nodel Ryan Reynolds ... Paul Nodel Ken Pogue ... Dean Hardwick Andrew Johnston ... DeWitt L. Harvey Gold ... Dr. Greeson Scott Swanson ... Reverend Leblanc William deVry ... Ben Tara Spencer-Nairn ... Heather Kathleen Duborg ... Hope Edward Diaz ... Derek Sara Johnson ... Brittany Kirsten Alter ... Sharon (as Kirsten Williamson) Terri Lynn Ibisoglu ... Female Student Brent Fordham ... Overweight Student Kirby Morrow ... Kirby

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