Improbable Cause

"Improbable Cause" is the 66th episode of the television series Star Trek: Deep Space Nine, the 20th episode of the third season. It is the first half of a two-part episode, concluded in the following episode, "The Die is Cast".

Set in the 24th century, the series follows the adventures of the crew of the space station Deep Space Nine near the planet Bajor, adjacent to a wormhole connecting the Alpha and Gamma Quadrants of the galaxy, as the Bajorans recover from a decades-long occupation by the imperialistic Cardassians. The Gamma Quadrant is home to a hostile empire known as the Dominion, ruled by the shapeshifting Founders.

In this episode, Deep Space Nine's security chief Odo investigates a bombing at the clothing shop of Cardassian spy-turned-tailor Elim Garak, leading him to discover secret Cardassian maneuvering against the Dominion.