The hour, titled “Impact,” sees Owen makes a decision about his future. Meanwhile, Tommy receives devastating news, while T.K. and Carlos worry about adopting Jonah. Elsewhere, Mateo gets his immigration status threatened after an altercation, a doomsday prepper gets trapped in a bomb shelter and The 126 and all of Austin brace for an asteroid crash!

9-1-1: Lone Star stars Rob Lowe as Owen Strand; Gina Torres as Tommy Vega; Ronen Rubinstein as T.K. Strand; Jim Parrack as Judd Ryder; Natacha Karam as Marjan Marwani; Brian Michael Smith as Paul Strickland; Rafael Silva as Carlos Reyes; Julian Works as Mateo Chavez; Brianna Baker as Nancy Gillian; Jackson Pace as Wyatt Harris; Skyler Yates as Evie Vega; and Kelsey Yates as Izzy Vega. Guest Cast in “Impact” includes Derek Webster as Charles; Wayne Knight as Milton; Miles Mckenna as Jax.