9-1-1 (8 p.m., Fox) - The show’s two-night Season 2 starts on the hottest day of the year, with first responders dealing with harrowing calls all around the city. Part 2 airs Monday. Jennifer Love Hewitt joins the cast this season.
Conrad & Michelle: If Words Could Kill (8 p.m., Lifetime) - Two teens with suicidal tendencies turn to each other during a family vacation, communicating mainly via text messages and forming a toxic relationship of dependency.
Rel (9:30 p.m., Fox) - This is a sneak peek the new Lil Rel Howery sitcom, which has its official debut on Sept. 30.