Uh-oh, the dinner that Tommy (Gina Torres) really needed to go well isn’t on 9-1-1: Lone Star. Following her proposal, Trevor (D.B. Woodside) revealed that she needs to meet his ex-wife, and Cassandra (Diandra Lyle) arrives in the October 14 episode. But as you can see in TV Insider’s exclusive sneak peek, things take a turn. First, Cassandra’s not happy to hear her daughter Melody (Bella Blanding) has been somewhere she took her before, with Tommy and her girls. “We had only gone that one time, when the girls were off from school,” Tommy says, trying to smooth things over. “So was that before or after you tried to poison my daughter?” Cassandra asks. (Ouch!) Trevor thinks “poisoning is a little dramatic” since “technically, all the ingredients were edible,” and Melody defends Tommy, arguing she basically deserved it. “You know how I get sometimes,” she says.