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The Astronaut Wives Club - Joel Johnstone cast as Gus Grissom

ABC's Astronaut Wives Club is firming up the rest of its cast.

Newsroom alum Joel Johnstone has boarded the drama from Gossip Girl's Stephanie Savage, The Hollywood Reporter has learned.

The 1960s-set drama tells the real story of the women who stood beside some of the biggest heroes in American history during the height of the space race. The series marks the first pilot Savage has written since she co-created The CW's long-running Gossip Girl with her Fake Empire cohort Josh Schwartz. The project is based on Lily Koppel's best-selling novel published last summer. Janice Williams brought the project to Groundswell. Nick Cassavetes will direct the first entry in the 10-episode drama, which has been moved from summer to midseason.

Johnstone will play Gus Grissom, described as an average student and athlete, he may be the least likely astronaut but he proves himself to be one of NASA's top men and an extraordinary engineer who flies in the Mercury and Gemini missions -- and becomes the first man to go into space twice.

He stars opposite Once Upon a Time's JoAnna Garcia Swisher, who is set as his wife, Betty Grissom.
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