About: Broken Link (Star Trek: Deep Space Nine)

"Broken Link" is the 98th episode of the science fiction television series Star Trek: Deep Space Nine, the 26th and final episode of the fourth season. Set in the 24th century, the series follows the adventures of the crew of the space station Deep Space Nine, which is adjacent to a wormhole leading to the distant Gamma Quadrant. The Gamma Quadrant is home to an expansionist empire known as the Dominion, ruled by the shape-shifting Changelings. In this episode, Deep Space Nine's security chief Odo, a Changeling who has rejected the Dominion, becomes ill and has difficulty holding a solid form, so the USS Defiant brings him to the Gamma Quadrant in search of a cure.