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She had a recurring role as Mila in Star Trek: Deep Space Nine, appearing in the episodes "Improbable Cause", "The Dogs of War" and the final episode, "What You Leave Behind".
Johnson is also well known to Star Trek fans for playing Broca, the Cardassian who becomes leader of the Cardassian Union in Star Trek: Deep Space Nines final two episodes, "The Dogs of War" and "What You Leave Behind".