Star Trek: Deep Space Nine never delved into the origin of the wormhole: it just was. Fans knew the wormhole was built by the ...

Deep Space Nine's Chief Medical Officer Dr. Julian ... the Pah-wraiths, who were Prophets (aka wormhole aliens) cast out from ...

Sisko and the crew must fight off rival alien species who want control of Deep Space Nine because of its strategic position close to a wormhole, which allows speedy travel to the far reaches of space.