Nathan Fillion is in high demand. Following his casting as Guy Gardner ... with Chris Mundy (Ozark), Damon Lindelof (Watchmen ...

The DC Studios show will see Fillion reprise the role of Guy Gardner, which he will play in this summer's Superman movie.

In real life, she had a baby. On the show, the characters she and Nathan Fillion play have talked about potential parenthood. Also this season -- Jenna's real-life fiancé played her abusive ex.

Nathan Fillion is in high demand ... with Chris Mundy (Ozark), Damon Lindelof (Watchmen, Lost) and comics writer Tom King teaming up as co-writers and executive producers. Production commenced ...