Star Trek : Voyager - String Theory Star Trek : Voyager – String Theory is a trilogy of novels , published by Pocket Books in — . Summary . In this trilogy , the crew of " Voyager " discovers a region of space that has been used for experiments by the Nacene , the race responsible for their presence in the Delta Quadrant in the first place . Having discovered a space station containing various information about the Nacene , the crew learns that the Caretaker , Suspiria , and numerous other Nacene are exiles , living away from their people as a punishment for tampering with the cosmic strings that the universe consists of ; the other Nacene believe it is a sacred duty to care for the strings ( although Q told the crew that the Nacene were exaggerating and the strings would be fine on their own ) . When " Voyager " came into possession of the Key that would allow the Nacene to return to Exosia , their home dimension from which they were exiled , a Nacene attempted to infiltrate " Voyager " by altering the crew ' s memories to make them believe that the Nacene was Captain Janeway ' s sister , who had been with them on the mission from the beginning . However , despite her attempts to escape attention , she was quickly discovered thanks to Naomi Wildman and Harry Kim , whose molecular structures were slightly out of sync with the rest of the crew due to them both coming from the duplicate ship created in , and were thus immune to her tampering ( she even activated a backup version of The Doctor to try and escape attention , but the two programs were so different that the crew soon realized that something was wrong ) . During their research into the space station , Q rescues Tom Paris and Harry Kim from an accident and subsequently recruits them to help him track down an Ocampa / Nacene hybrid who holds the key to repairing damage that has recently been caused to the space / time continuum . During this appearance , Q reveals that omnipotent beings are actually rather fond of games of choice and chance , as it is only under these conditions that beings such as Q can feel the thrill of not being in total control . The Nacene launched an assault on " Voyager " to regain the Key , but " Voyager " was able to hold them off , using the neurotoxin that Tuvok had developed in their encounter with Suspiria . The Doctor becomes trapped in Exosia when the rift is briefly opened , causing photonic energy to be drawn in , and then gets sent into Ocampa ' s distant past by a Nacene who wanted The Doctor to prevent the birth of a Nacene - Ocampa hybrid that it perceived as a threat . Developing a fondness for the hybrid ' s mother , an Ocampan general who reminds him of Kes , The Doctor chooses not to prevent the birth , and the Nacene - Ocampa hybrid was able to stabilize reality and negotiate peace between the two Nacene factions ( after the hybrid ' s future self was tracked down by Tom Paris and Harry Kim , aided by a young Q ) . Aided by Kes , the Nacene evolved to a higher stage of being , as Kes and her " son " – only Kes ' body could cope with the strain of giving birth to the hybrid , although another Ocampan contributed the genetic information – returned to Ocampa to repair the ecological damage that the Nacene caused long ago , and , three years later , rain finally fell on Ocampa once more . However , as a result of the rift being opened , all photonic energy in this region of space has been drained away , with a new history being created to ' explain ' the change , as well as Janeway ' s exposure to the Key leaving her vulnerable to certain ' mood swings ' in the future , with her only chance at recovery being a continued ignorance of the events that have taken place .