Ally Sheedy High Art, The Breakfast Club will play Carol, an overbearing but absent parent who is sick of sending Samantha to rehab.
The half-hour project comes from 20th Television.
Once more details are available on who she is dating, we will update this section.
Henderson will portray Olivia, a brilliant melancholic lesbian who works as one of The Greeters at AA.
Sheedy is repped by Innovative Artists and Red Letter Entertainment.
Millennials is a generation who grew up with computers, internet and social networks.