The actress, who plays murdered Housewife Mary Alice Young, will portray oil tycoon Bobby Ewing's wife Ann.
Patrick Duffy will return as Ewing and Metcalfe will play his son.
And Strong can't wait for fans to see the new show, telling Eonline.com, "It's not a remake. Most people are thinking we're remaking it. It's a continuation, it's the new generation... It's nice because it's going to be invented in a very modern way.
"It's very surreal. I'm talking to Sue Ellen (Linda Gray) and J.R. (Larry Hagman) and I'm going, 'OK, pinch me. This is very strange.'
"They were absolutely welcoming. They couldn't have been kinder, more humble, more hospitable. In those circumstances, you would expect that they would have the right to kind of have ownership and they were so generous and so inclusive."
And she has big plans for her gun-wielding character: "I'm hoping that I end up in an evening gown in a pool at some point. I do get to tote a shotgun, so that already kind of got me off to a bang."