9-1-1: Lone Star

10 p.m. on (9); 10:01 p.m. on (22)

Gina Torres (“Suits”) joins this action-packed spinoff series in the role of Captain Tommy Vega, who joins the 126 as Season 2 opens. Even as Owen (Rob Lowe) gives this newcomer a warm welcome, though, he must steel himself for the unexpected arrival of his ex-wife Gwyneth (Lisa Edelstein of “House” in a recurring role), in Austin to check on their firefighter son, T.K. (Ronen Rubinstein). Meanwhile, the team wrestles with an emergency that’s unfamiliar to their region. Jim Parrack and Sierra McClain also star.