Brian Thomas Smith As Zack Johnson
The character of Zack Johnson, played by Brian Thomas Smith, was a dim-witted but well-intentioned jock-type who dated Penny numerous times following her second break-up with Leonard. Penny found Zack’s stupidity to be off-putting, and he frequently drove her back into the arms of Leonard. Brian Thomas Smith has been in a number of advertisements for well-known companies such as State Farm, Chevrolet, Taco Bell, and Pizza Hut over the course of his career.
Brian Thomas Smith As Zack Johnson
Wyatt McClure As Billy Sparks
Billy Sparks is played by Wyatt McClure in the Young Sheldon film. During the first season of The Big Bang Theory, Sparks was referenced as one of Sheldon’s childhood bullies. Sparks is shown to be simple-minded, although he maintains his good-natured demeanor in Young Sheldon.
Wyatt McClure As Billy Sparks
