A new Young Sheldon season 5 promo clip reveals Pastor Rob flirting with Mary. The Big Bang Theory prequel is returning this week with a fresh outing after taking its final hiatus.

And with only two episodes left for the year, CBS is starting to wrap up some of its season-long plotlines, including the burgeoning relationship between Mary and Rob.

Rob is a fairly new character in Young Sheldon, but from the get-go, it's clear that his developing dynamic with Sheldon's mom could be detrimental to Mary's marriage.

Missy was the first one to develop a crush on him as her Sunday School Youth Pastor, but it was eventually revealed that Mary was also starting to like Rob.

A previously released promotional image for Young Sheldon season 5, episode 21 reveals that Rob will also finally meet George, but it won't be in the Coopers' home.

Instead, it will be over at Pastor Jeff's office. It's curious if this aforementioned scene takes place before or after that introduction.

Nevertheless, it's a little bit bold on Rob's part to seek out Mary in her own house and make inside jokes with her knowing that she is married.

It's worth noting that long before their introduction, George already harbors some ill feelings towards Rob after he caught him and Mary smoking in the church parking lot.