The Connors (8 p.m., ABC) – An email from the school that prohibits certain Halloween costumes (including Mark's) provokes a discussion between Dan and Darlene.

This is Us (9 p.m., NBC) – Fighting Toby's depression, Kate seeks advice from Rebecca. Meanwhile, Randall spends time with Kevin, who is obsessed with Jack's past.

The rookie (10 p.m., ABC) – After Nolan and Talia lose control of the crime scene, they begin to debate whether people are fundamentally good or bad.

Frontline: the Facebook dilemma (10 p.m., PBS / UNC) – We obtain the second part of the Frontline series in two parts on the impact of the social media platform on society and democracy.