- The Control Voice: Throughout the ages humans have looked to the heavens and wondered, 'Where did we come from, and where are we going?' But will we find those answers in the stars, or in ourselves?
A sequel to "Double Helix". On board a spaceship, the students suspect they have been tricked when they start disappearing.
- The Control Voice: It is said that those who do not learn from history are doomed to repeat it. Will we be wise enough to learn?
The Origin of Tropes:
- Adam and Eve Plot: The sample size is 8 students and one professor, and it is immediately pointed out that they could not possibly repopulate the planet alone. It's hand waved by the spaceship that took them into the future, which altered their genes to ensure maximum diversity and created hundreds of babies to further pad the gap. Subtly played with in the fact that both the professor and his son are exempt from being "Adams" due to a genetic disease (and are therefore vaporized), but live on as holograms to assist their friends.
- Earth All Along: Hope and the six students realize that they are on Earth in the future when they come across the ruins of the half-collapsed Golden Gate Bridge.
- Fling a Light into the Future: A group of students is brought to the future where they find that humanity, in the interim, got heavily into genetic manipulation, basically dooming the human race. When they realize the small group of them isn't enough to sustain humanity for more than a generation or two, they later find enough babies of different genetic mixes, in the ship that brought them to the future, to give the human race a second chance.
- Immediate Sequel: This episode begins several minutes after the events of "Double Helix".
- Interface with a Familiar Face: The ship uses holograms of Dr. Martin Nodel and his son Paul, both of whom it had previously absorbed, to communicate with Hope and the six students.
- Ruins of the Modern Age: This trope is combined with Earth All Along. Hope and the six students realize that they are on Earth in the future, some point after the 23rd Century, when they come across the half-collapsed Golden Gate Bridge.
- Sterility Plague: Humans began to experiment with genetic engineering in or before the 23rd Century, giving them superhuman abilities (which included having wings) but rendering them sterile. As such, humanity eventually died out. The ship which brought Hope and six students to the future Earth is able to take genetic samples from them to create babies, altering their DNA sufficiently to prevent inbreeding.
- Sudden Name Change: In "Double Helix", Dr. Nodel's first name is Martin. Here, his first name is Eric.
- Sudden Sequel Death Syndrome: Dr. Nodel and his son Paul were the two main characters of "Double Helix". Here, they are absorbed by the ship, effectively killing them, as they possess a genetic disease.
- Winged Humanoid: Hope and the six students find the skeleton of a winged human, created using genetic engineering, on Earth in the future.