Star Trek: Deep Space Nine

In Purgatory's Shadow (5x14)

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Stardate: Unknown After a coded Cardassian message from the Gamma Quadrant is detected, Garak and Worf attempt a rescue. However, they are captured by the Jem'Hadar and imprisoned in the same cell as Enabran Tain, General Martok, and the real Julian Bashir, who had been secretly replaced several weeks prior without any notice. The Jem'hadar fleet invades the Alpha Quadrant when an attempt to seal the wormhole is sabotaged by the changeling-Bashir.