The Explosion Implosion S4E4 - The Explosion Implosion 2017
As Howard worries about fatherhood, he and Sheldon bond when they jointly assemble a model rocket. Meanwhile, Penny bonds with Leonard's mother, Beverly, much to his concern.
- Released: 2017-10-16
- Runtime: 50 minutes
- Genre:
- Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Melissa Rauch, Mayim Bialik
- Director: Mark Cendrowski