Johnny Galecki is a Belgian-born American actor, best known for his roles as David Healy in Roseanne, Rusty Griswold in National Lampoon's Christmas Vacation, and as Leonard Hofstadter in The Big Bang Theory.
Blue is a puppy who puts her paw prints on three clues. Steve has to deduce the clues (with the help of off-screen children) to figure out what Blue wants to do.
