Wolowitz and Sheldon bond when they drive to the desert to shoot off a model rocket. Also, when Leonard's mom, Beverly, finds a new best friend in Penny, it rubs Leonard the wrong way.false2018-11-24 18:50:13The Explosion ImplosionMark Cendrowski7.22017TV-PGtt6674498631119821ComedyRomancehttps://www.thetvdb.com/banners/episodes/80379/6311198.jpgChristine BaranskiGuestStarhttps://image.tmdb.org/t/p/original/6CtqtEoUZMS48h3SmvzgubiQYVR.jpgDana L. WilsonGuestStarhttps://image.tmdb.org/t/p/original/vysjAjGDfBa4HnVPD1eVvYo7GB2.jpgMichael Patrick McGillGuestStarhttps://image.tmdb.org/t/p/original/qaOy0sr1Su79Odjp5XVOqgWdOrL.jpg4112017-10-16subripsubripprogressiveTrueFalse