Amy and Bernadette throws a mini party for Penny in 'Big Bang Theory' Season 9 Episode 3. On the other hand, the boys try to rush Leonard to Mexico for a bachelor party. Also, the executive producers stated that Keith will reprise his role as Penny's dad. Additionally, Sheldon still struggles to win back his ex Amy.

According to IB Times, Amy (Mayim Bialik) and Bernadette (Melissa Rauch) throw a mini bachelorette party for Penny (Kaley Cuoco), who finally calls her father and reveals that she just got married in Las Vegas. Aside that, the nerdy gang rushes Leonard (Johnny Galecki) to Mexico for a bachelor party. Unfortunately, the gang end up with a flat tire and manage to change it.

On the side note Gospel Herald reports that, the show's executive producers confirmed in an interview that Penny's dad Wyatt, who is played by Keith Carradine will reprise his role after Penny and Leonard's big fight.

Meanwhile, Sheldon Cooper (Jim Parsons) continues to try to win Amy back as mentioned on Latin Post. However when his efforts failed, Sheldon became frustrated and throws a bad mouth at his ex instead in the upcoming episode of 'Big Bang Theory'.

Penny finally has the strength to call her dad and admit everything she did. Because of that, Amy and Bernadette throws a mini party for her. Meanwhile, the nerdy boys rushes Leonard to a bachelor party in Mexico. Also, Sheldon is still trying to win his ex Amy back to him. Moreover, the executive producers confirmed that Keith will reprise his role as Penny's dad in 'Big Bang Theory'.

'Big Bang Theory' Season 9 Episode 3 is entitled as, 'The Bachelor Party Corrosion' which is set to air on Monday Oct. 5, 2015 exclusively on CBS. 'Big Bang Theory' is an American situational comedy.