Several episodes of The Big Bang Theory showcase Jim Parsons' Sheldon Cooper at his best, funniest, or most annoying.

Young Sheldon, a prequel series to The Big Bang Theory, follows 9-year-old Sheldon Cooper (Iain Armitage) living his everyday life in Texas with his family. As normal as one’s life goes, Sheldon ...

TVLine is taking stock of the many nods, cameos and crossovers linking "Young Sheldon" to its predecessor, "The Big Bang Theory." First launched in September 2017, the long-running prequel filled in ...