Season 8, Episode 21 - The Communication Deterioration
Aired April 16, 2015
When Raj is giving the job of crafting a message for NASA in case a mission ever discovers alien life, the guys offer to help him work on the project. When Howard and Sheldon try to take over, Raj chooses to work on the project with Leonard instead. Meanwhile, Penny must decide whether to audition for a movie or instead focus on her well paid pharmaceutical sales job.
Season 9, Episode 18 - The Application Deterioration
Aired March 10, 2016
Leonard, Sheldon, and Wolowitz run into problems when they file for a patent for their infinite persistence gyroscope. Also, Penny, Amy and Bernadette give Koothrappali dating advice when Emily reaches out to him after their breakup.