Insider says DR. PHIL MCGRAW is a tyrant – both on and off-set – as he feeds his giant narcissistic ego.

Dr. Phil makes a living counseling others, the good doctor is anything BUT on the set of his syndie yak fest and marches around like a fascist dictator, an insider dished to RadarOnline.com.

According to the source, Dr. Phil, 62,  has a temper and explodes with anger when things aren't done his way — that includes yelling at his employees, his guests and even his long suffering wife, Robin.

"He's like a fascist dictator on a set of quivering female servants, “the insider revealed.  “I can feel the fear on the set. There seems to be a reason he hires a nearly all female staff…he seeks out the vulnerable type of person that's reliant on their paycheck from him so they don't fight back."

The insider claims that while Dr. Phil acts like he's there to help his troubled guests, he actually intimidates them into getting the sound bites he needs to push for high ratings.

"Guests often seize up once they get in front of Dr. Phil because he's so intimidating. He's NOTHING off camera like he appears on camera," the source said.

"Before he gets to the sound bite he's looking for there's no sense of a gentle, sympathetic, professional view. It's all about the sound bite, and he'll bully the guest off-camera until he gets the sound bite he needs."

Dr. Phil is also branded by the insider as having a huge ego, being confrontational and emotionless.

"It's all about feeding his narcissistic enormous ego. It's his way and everyone else bows and stays clear of his path," the source said.

"There are camera men that used to work for him…They think he's an absolute pig!

"While Dr. Phil is filming an interview or segment, Robin will sometimes just sit in a back corner watching," the source said.

"She has absolutely no say in the way things are run. And when Dr. Phil flips out or gets aggressive with staff and guests, Robin just sits there with a sad look on her face like she doesn't agree with him, but can't speak up because she's just as fearful of him as everyone else!"