These are able to instantaneously teleport spaceships as well as people over long distances. In the episode "" of the series "Star Trek: The Next Generation", the "Enterprise"-D discovered the former homeworld of the Iconians. These people were able to instantaneously teleport people over long distances with the help of Iconian Gateways. To ensure the gateway did not fall into the wrong hands, Captain Picard destroyed it. A year later, in "", terrorists on the planet RutiaIV used a space folding teleporter called an inverter. However, this caused progressive physical harm to people during transport; multiple use almost always ended in death. The USS "Voyager" came in touch with this technology several times on their way home. In the episode "" the crew tried to buy a Spatial Trajector from the Sikarians. This wraps an object in a kind of subspace bubble, and teleports it to another location using spatial folding. The range was 40,000 light-years. However, the technology was not compatible with the warp core and almost destroyed "Voyager" when it was used. Three years later, in the episode "", "Voyager" discovered a stranded spaceship with a coaxial warp drive. This also used spatial folding for locomotion. But the system was very unstable and if there is a fault in the drive it could cause a tear in the space-time continuum. A replica of the drive was only tested in a shuttle and never used for the "Voyager". Last but not least, spatial folding appeared as a Geodesic Fold in the episode "". A geodesic fold occurs when a Verteron beam is fired at the atmosphere of a giant star at two different locations. This connects both points in space and creates a short lived passage. However, this was not usable because of deadly radiation that occurred during flight. A Ferengi ship's faked message from the Alpha Quadrant made the crew believe there was a safe passage. However, the Ferengi only wanted to get the Borg technology aboard "Voyager" and would have let the crew die. At the last moment, travel through the passage was aborted. The episode "Metamorphosis", from "The Original Series", establishes a backstory for the invention of warp drive on Earth, in which Zefram Cochrane discovered the "space warp". Cochrane is repeatedly referred to afterwards, but the exact details of the first warp trials were not shown until the second "" movie, "".