Leonard Hofstadter(86 episodes, 2007-2010) 约翰尼·盖尔克奇/Johnny Galecki
Sheldon Cooper(86 episodes, 2007-2010) 吉姆·帕森斯/Jim Parsons
Penny(86 episodes, 2007-2010) 卡蕾·措科/Kaley Cuoco
Howard Wolowitz(86 episodes, 2007-2010) 西蒙·赫尔伯格/Simon Helberg
Raj Koothrappali(86 episodes, 2007-2010) 昆瑙·内亚/Kunal Nayyar
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