A jumpgate is a fictional device able to create an Einstein–Rosen bridge portal (or wormhole), allowing fast travel between two points in space.

It is considered a violation of normal rules of engagement to attack them directly, as the jumpgate network is needed by every known spacefaring race.

However, in wartime, it is common for powers to program their gates to deny access to opposing sides, thus forcing enemies to use their own jump points.

Later, an alien interrogator discovers the existence of the hidden information and thus Crichton becomes embroiled in interstellar politics and warfare while being pursued by all sides (as they want the ability to use wormholes as weapons).

Unable to directly access the information, Crichton is able to subconsciously foretell when and where wormholes will form and is able to safely travel through them (while all attempts by others are fatal).