"Apocalypse Rising" is the 99th episode of the television series Star Trek: Deep Space Nine, the first episode of the fifth season. With Klingon leader Gowron having declared hostilities against the Federation, Worf, Sisko, Odo, and O'Brien go on a mission deep into Klingon territory. "Apocalypse Rising" was seen by about 5.5 million viewers when it debuted.