- as Sheldon Cooper
- as Mandy McAllister
- as Mary Cooper
- as Dr. Linkletter
- as George Cooper, Sr.
- as Dr. Hayes
- as George Cooper Jr.
- as President Hagemeyer
- as Missy Cooper
- as Dr. Evans
- as Connie 'Meemaw' Tucker
- as Brenda Sparks
- as Sheldon Cooper (Voice)
- as Dr. John Sturgis
- as Dr. Prakash
- as Dr. Adams
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Watch "Young Sheldon > Little Green Men and a Fella's Marriage Proposal":