Stargate Atlantis casts real-life siblings David and Kate Hewlett as Rodney McKay and his sister Jeannie. Here's how that ...

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TAYLOR DEARDEN: (As Melissa 'Mel' King) Everyone calls me Mel. I'm so happy to be here. DETROW: Mel is portrayed by actress Taylor Dearden, who joins me now. Welcome to ALL THINGS CONSIDERED.

TAYLOR DEARDEN: (As Melissa 'Mel' King) Everyone calls me Mel. I'm so happy to be here. DETROW: Mel is portrayed by actress Taylor Dearden, who joins me now. Welcome to ALL THINGS CONSIDERED. DEARDEN: ...