Astronaut Mike Massimino to Guest Star in BIG BANG THEORY Finale

TVGuide.com reports that Astronaut Mike Massimino will return to CBS's THE BIG BANG THEORY for a guest starring role in the show's season finale. 

The astronaut first appeared on the comedy in an episode entitled 'The Friendship Contraction', in which Simon Helberg's character and Massimino video-chatted over Howard's upcoming trip to the International Space Sation. 

In the season finale, Massimino will be present as the fictional space shuttle prepares to launch. The episode is set to air on May 10 at 8/7 on the CBS network. 

In THE BIG BANG THEORY, Leonard and Sheldon are brilliant physicists – wizards in the laboratory, but socially inept outside of it. Enter beautiful, free-spirited neighbor, Penny, who aims to teach them a thing or two about life. While Leonard spends his days looking for love, Sheldon is quite content video-chatting with platonic partner Amy Farrah Fowler, or playing Star Trek 3D Chess with their ever-expanding universe of friends, including fellow scientists Koothrappali and Wolowitz, and Wolowitz’ fiancée, the adorable microbiologist, Bernadette.