When does Scorpion return?

The series stars Elyes Gabel (Walter O'Brien), Katharine McPhee (Paige Dineen), Eddie Kaye Thomas (Tobias Curtis), Jadyn Wong (Happy Quinn), Ari Stidham (Sylvester "Sly" Dodd), and Robert Patrick (Cabe Gallo) The series premiered on September 22, 2014. CBS cancelled the series after four seasons.