The full names and occupations of the characters in The big bang theory are: Dr. Leonard Leakey Hofstader Ph.D., Experimental Physicist; Dr. Sheldon Lee Cooper B.S. M.S. M.A. Ph.D. Sc.D., Theoretical physicist; Howard Joel Wolowitz M.Eng, Aerospace Engineer; Dr. Rajesh Ramayan Koothrappali Ph.D., Astrophysics; Dr. Bernadette Mary Ann Rostenkowski Ph.D., Microbiology; Dr. Amy Farrah Fowler Ph.D., Neurobiology.
Kaley Cuoco missed filming a few episodes of season 4 because of a broken leg, the result of a horseback riding mishap. In her first appearance following the accident, she was filmed standing behind a counter.