"The Big Bang Theory season 8 spoilers revealed that Sheldon will reunite with Leonard and Amy after he boarded a train following the finale's developments. Tension is going to be high in the premiere episode and it's not because of the huge contracts the main cast just signed with the network.

According to the official "The Big Bang Theory" season 8 spoilers by CBS: "Leonard and Amy take an unexpected road trip to Arizona to pick up Sheldon. Meanwhile, Penny interviews for a job at Bernadette's company and Howard is weirded out by Stuart's relationship with Mrs Wolowitz."

The premiere episode is going to be titled "Locomotion Interruption."

The Entertainment Weekly reported that the announcement of Penny and Leonard's wedding shocked Sheldon, and coupled with his challenges at work as well as the comic book store being razed, he just couldn't cope with all the drastic changes.

He went to the train station at the end along with the cliffhanger, did he step onto the train or not?

The EW dished out "The Big Bang Theory" season 8 spoilers when it said that by the second episode, Sheldon would already have been back at the apartment and now becomes a teacher. Howard will also reportedly enrol in his class which should provide some awkward but funny moments.

Meanwhile, Mayim Bialik, who plays Amy in the show, revealed more "The Big Bang Theory" season 8 spoilers to Glamour mag as she said there's going to be some tension during the first episode, especially since her character will seemingly be insulted that Sheldon ran away without going to her first.

She also weighed in on Penny's new job as a sales rep for a pharmaceutical company. She told Glamour magazine that Amy and Bernadette (Melisa Rauch) always looked up to Kaley Cuoco's Penny as far as social skills go.

In episode 2 of "The Big Bang Theory," Mayim Bialik revealed that the job will pit "Bernadette and Penny against each other."