"Criminal Minds" season 12, episode 7 titled "Mirror Image" unfolds the backstory of Dr. Tara Lewis after a man pretends to be her brother. Meanwhile, Mr. Scratch makes a creepy comeback. How would his story evolve in the episode as a serial killer who haunted Hotch's son Jack?

Tara's Past Unveiled

An episode after learning the real status of Aaron "Hotch" Hotchner (Thomas Gibson), "Criminal Minds" season 12, episode 7 sheds light on the life of Tara (Aisha Tyler) and where she comes from. The official episode synopsis reveals that the Behavioral Analysis Unit (BAU) pursues an investigation about "a man who fully believes he's Dr. Tara Lewis' brother" and who happens to know her deeply, including her family background.

Who Is This Man?

When the mystery man shows up, Tara cannot reach her real brother. Later on, BAU finds out that the man who pretends to be his brother has kidnapped her real brother. What is his motive? No one knows yet. However, Tara's curiosity is slowly undermining her focus, thus calling her father in the interrogation room. Her father seems confused. Is Tara's father hiding something? Could this man be Tara's real brother? That's what viewers should look forward to.

Mr. Scratch Returns

In the meantime, the official preview of episode 7 reveals the return of Mr. Scratch (Bodhi Elfman) and his wicked laugh. "Criminal Minds" season 12, episode 7 spoilers reveal that the serial killer will play a major stint in this episode as his stalking to Hotch's son, Jack, led to the resignation of the former BAU chief. Mr. Scratch's cameo will detail a little to moderate about how his stalking forced Hotch and his son to enter witness protection. While his resignation was the only thing revealed in the previous episode, Hotch's departure is expected to be detailed in episode 7.

"Criminal Minds" season 12, episode 7 will air Nov. 30 at 9:00 p.m. ET on CBS.