'Celebrity Apprentice' stars John Rich (left), and Marlee Matlin (right) with Donald Trump (centre)

Celebrity Apprentice finalist John Rich called upon another famous reality-competition series to describe what the experience has been like.

“It’s like ‘mental Survivor,’ ” said Rich, who squares off against Marlee Matlin in the season-finale of The Celebrity Apprentice Sunday on NBC and Global.

“You know if you crack, you’re going to get beat over the head with it for the rest of your life.”

Certainly some of the now-eliminated participants on the Donald Trump-hosted show - namely, Meat Loaf, NeNe Leakes and Gary Busey - cracked at various times this season.

“I think it’s all about charity (each celeb plays for the charity of their choice) and Red Bull,” Matlin said. “I was drinking Red Bulls and I have to say, the hardest thing about the show is you don’t realize you have to eat.

“John’s right, it’s really tough. But you stick it out for the charity.”