"In the Blood" is an episode of The Outer Limits television show. It was first broadcast on 6 July 2001, during the show's seventh and final season.

The episode opens with Callie Whitehorse Landau (Irene Bedard), an astrophysicist of Navajo heritage, and her husband Alec (Cameron Daddo), an expert in space medicine, discussing their recent loss of their unborn child "Amanda", to a spontaneous abortion. Shortly after this scene, they are visited by NASA Flight Crew Director James Dreeden (Greg Evigan) and are asked to embark on an astounding exploratory mission through an apparent rip in time and space. Along with Dr. Louisa Kennedy (Helene Joy), a navigation expert, the small team of four passes through a quantum hole torn into the very fabric of the universe and enter another continuum, a trans-space just beneath its surface. It is unlike anything the crew has ever seen — but for Callie, trans-space triggers vivid hallucinations and a powerful realization that their presence has caused a serious imbalance in the universal order. Dreeden is determined to return to Earth with their startling discoveries, but Callie is convinced the survey ship's re-entry could have disastrous consequences for all of humanity.

Immediately after crossing into the alternate universe which the crew members call "trans-space", their ship, the Copernicus, has difficulty coping with altered gravity waves and bizarre particles (called "gravitons") which appear to contain 5 nuclei. Callie appears to be ill to the other three crew members while the ship is being tossed by gravity waves. Although she states that she feels well, her husband, a physician performs an examination and discovers that she is pregnant. In the meantime, the crew sees a number of stars floating in space which appear dark.

Shortly later, Callie sees a vision of her grandmother that implies that the order of the universe has been altered by their intervention. After this hallucination Callie realizes that the gravitons with five nuclei are similar to white blood cells and hypothesizes that they may be part of a subatomic immune system protecting the dimension of trans-space from alien objects.

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