Mark-Paul Gosselaar guest stars as Chase, Max's ex-roommate. He claims he wants revenge for Max ruining his life, but realizes that Max's life is so pathetic, he can't sabotage it. Elsewhere, Dave challenges Alex to use her Groupons. ABC, 7:30 p.m.
When a bruised and battered Violet accuses Dixon of assault, Katherine has no choice but to arrest him. While Sheriff Lamb struggles to find a way to help his son, Savino has trouble of his own. Anna Camp and Melinda Clark guest star. CBS/Global, 8 p.m.
In the new episode Ring of Fire, Nick tries to stop a volcano. Juliette is overwhelmed by memories, and Adalind connects with a new ally in Europe. NBC/CTV, 8 p.m.
George Stroumboulopoulos: best of the week
Jay Leno: Willie Geist, Imagine Dragons
David Letterman: James Franco, Ed Sheeran
Craig Ferguson: Harrison Ford, Melissa Rauch
Jimmy Fallon: Justin Timberlake, Hayden Panettiere