Billy Sparks was one of Sheldon's childhood bullies. He was mentioned being on Sheldon's all-time enemies list in "The Creepy Candy Coating Corollary" and “The Shiny Trinket Maneuver", where he shoved a Mexican Peso up Sheldon's nose. He appears in the series spinoff "Young Sheldon".
In S01E03, having a crush on Missy he gifted her with a basket full of eggs. When the Cooper family cooked and ate those eggs, they became violently ill from food poisoning as it turns out those eggs were Salmonella-contaminated.
In S01E12, Sheldon wrote on a TANDY 1000 SL System computer that Billy Sparks threw a chicken at him.
- Father: Herschel Sparks
- Mother: Brenda Sparks
- Sister: Bobbi Sparks
- It is unknown that Billy might be Missy's soon to be ex-husband and has two children.
|The Big Bang Theory Episodes|
|Young Sheldon Episodes|
|Appeared||M = Mentioned||Did not appear||Not aired/Not available|
|V = Voiced||C = Cameo||F = Flashback||I = Indirectly mentioned||P = Pictured|