"The Big Bang Theory" season 8 spoilers reveal that the show will pay tribute to death of the actress who played Wolowitz's mother, as Leonard and Penny's living arrangement will test whether they push through with the wedding.

Executive producer Steve Molaro teased season 8 spoilers for "The Big Bang Theory" to TVLine as he said that Leonard and Penny will have to go through the birthing pains of trying to live together. He said they are not trying to rush their wedding even if the two characters are already engaged.

He said that in the next episodes, they will pay a fitting tribute to Carol Ann Susi, who played the voice

of Wolowitz's mother. The character's face was never seen on TV.

"The death of Carol will be dealt with. We just needed time to process the loss of our friend," he said.

The synopsis for "The Space Probe Disintegration" reads: "When the guys finally agree to do something the girls like, it leads to a confrontation between Leonard and Sheldon. Wolowitz tries to distract Raj, who is anxiously awaiting data from a space probe he helped launch. Meanwhile, Sheldon and Leonard go dress shopping with Penny and Amy,

Leonard living in with Penny won't make Sheldon happy, but ultimately they come to an agreement.

"Leonard hasn't moved in with Penny because the last time he mentioned it, Sheldon ran away," the synopsis said. "Sheldon can't think of a life without his best friend in it. They both start to cry and Sheldon tells him that he should move out if that what he really wants to do. They agree that he should do it in stages and the two nights a week at Penny's apartment gets reduced to once a week. Also Leonard can whistle in the apartment when Sheldon is not there."

Watch out for more "The Big Bang Theory" season 8 spoilers ahead of the airing date on January 8 on CBS.