The Big Bang Theory Sheldon (Jim Parsons) wants to settle an old grudge after his friends left him out of an investment that could have yielded big profits. Also, a video from 2010 reveals a relationship secret for Leonard and Penny (Johnny Galecki, Kaley Cuoco). Simon Helberg, Kunal Nayyar and Mayim Bialik also star. 8 p.m. CBS
Supernatural With their search for Jack running into one roadblock after another, Sam and Dean (Jared Padalecki, Jensen Ackles) reluctantly try to steal a trunk from the demon Barthamus (guest star David Cubitt) in exchange for a locater spell. 8 p.m. KTLA
Gotham Sofia (Crystal Reed)...