Penny (Kaley Cuoco-Sweeting) may have said "I do" in "The Big Bang Theory" Season 9 premiere, but that does not mean she will not "undo" her marriage to Leonard (Johnny Galecki) in episode 2. Both Leonard and Penny and Sheldon (Jim Parsons) and Amy's (Mayim Bialik) relationships took a huge blow in episode 1 with Amy breaking up with Sheldon for good and Penny finding out that Leonard works with the girl he had kissed. The synopsis for episode 2, "The Separation Oscillation," reveals that repairing those relationships will be no easy task. 

According to the synopsis for the new episode, Leonard, desperate to make things right with Penny, will decide that the only way to show Penny his commitment is to go confront the girl he kissed on his North Sea expedition. That means that next week fans will be introduced to Mandy (Melissa Tang), a woman Sheldon described as brilliant and attractive and who could do "way better than Leonard." Will Leonard seeing Mandy help put Penny at ease? Will Penny meet Mandy? 

Meanwhile, Sheldon has his own plan for how to handle his own relationship troubles. The synopsis teases that he will make a new episode of his web series, "Fun with Flags," to address the big breakup. In the promo for episode 2, Sheldon can be seen insulting Amy while filming the video. 

"Everything my girlfriend could do, I can do with my right hand," says Sheldon.

Amy's response: "I'm going to kill him."

Watch the promo for episode 2 below:

How will Amy react to Sheldon's "Fun with Flags" video? Will Leonard be able to make things right with Penny? Fans will have to wait to find out. "The Big Bang Theory" airs Mondays at 8 p.m. EDT on CBS.