The Big Bang Theory 10×15 “The Locomotion Reverberation” Season 10 Episode 15 Promo – Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system. Also, Penny and Amy take Bernadette out for the night, leaving Raj and Stuart to care for baby Halley, on THE BIG BANG THEORY, Thursday, February 9th on CBS. Dean Norris returns as Colonel Williams.