Nash plays "Simone Clark" an FBI trainee who finds an ally in "Officer John Nolan" played by Nathan Fillion.
"She's a force of nature, she's her own thing. There's the FBI way of doing things and then there's the Simone Clark way, that's why she gets in so much trouble." Nash said. "The one thing I really love about her is that she's a huge flirt."
It's strongly rumored that this 2-part episode story arc could be the basis for a spinoff series this fall for Nash.
"Our fingers are crossed," Nash said.
"All signs point to yes," Fillion said. "If I had a Magic 8 Ball here, that's what it would say, because it's looking very, very positive. It's a lot of fun watching Niecy on TV I have to say, it's...we're pretty certain."
In their first of two episodes together, one Simone Clark's former students is suspected of terrorism following an explosion at a local power station.
"We blow things up, there's a lot of explosions," Fillion said.
Don't miss this all-new episode of "The Rookie," Sunday, April 24 at 10:00 p.m. EDT on ABC.
Part two airs the following week on Sunday, May 1 in the same time slot.
You can also watch episodes on-demand and on Huluthe day following their premieres.