Jessica, Amber and Brittney claim that their former stepfather, Steve, sexually abused them for years while they were young girls. Brittney also claims that Steve physically abused her and threatened to kill her sisters and their mother.

TELL DR. PHIL YOUR STORY: Betrayed by a loved one?

After taking a plea which did not require him to admit wrongdoing, Steve was convicted of sexual abuse and served two-and-a-half years in prison, but Steve maintains his innocence. He claims that the sisters are lying and that their mother, upset that he asked for divorce, made the then-young girls lie about being abused by him.

WATCH: Woman Who Claims She Was Abused By Stepdad: ‘Steve Would Say ‘Let’s Tingle Each Other’’

For the first time in 10 years, the women face off with Steve on Dr. Phil’s stage on Monday's episode. Watch the video above to see what happens and why the conversation gets heated quickly.

And Steve agrees to take a polygraph exam. On Tuesday, see what his results reveal. Check here to see where you can watch.

TELL DR. PHIL YOUR STORY: Conflict so big it needs a Dr. Phil solution?

Dr. Phil To Guest Accused Of Molestation: ‘You Have The Worst Judgment Of Anybody I Can Imagine’