SERIES Jay Leno's Garage Jay competes against race car driver Bryce Menzies in a soapbox race. 7 and 10 p.m. CNBC The Big Bang Theory Koothrapalli (Kunal Nayyar) discovers that the woman he’s been dating (guest star Beth Behrs, “2 Broke Girls”) has a husband (guest star Walton Goggins, “Justified”)...