Star Trek: Deep Space Nine - Dramatis Personae

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A Klingon ship blasts through the wormhole and explodes, but not before an injured Klingon, shrouded in a strange violet light, transports to the station and dies. Soon everyone on board begins to undergo bizarre personality changes, Bashir (Siddig El Fadil) becomes cold and calculating; O'Brien (Colm Meaney) turns power-hungry and suspicious; Dax (Terry Farrell) grows dreamy and distant; and Major Kira (Nana Visitor) plots to overthrow Sisko (Avery Brooks). The only one who seems to be unaffected is Odo (Reni Auberjonois). While he searches for clues to the crew's mysterious behavior, the senior officers begin to choose sides as the battle for control of the station rages. Odo is the only one who can avert a full-fledged mutiny!.