CBS has made the call on Monday drama Scorpion, opting not to renew the high-octane drama for a fifth season.

After a high-flying start as a breakout hit when it first launched in the Monday 9 PM slot, Scorpion found itself heavily on the bubble for return for the second year in a row. It has struggled in the Monday 10 PM time period, and is one of the least watched CBS scripted series currently on the air in Live+same day.

CBS had been expected to do some major cleanup on Mondays where it’s seen its ratings fortunes falter. Scorpion is the first official cancellation on the night, it likely won’t be the last.

Remaining on the bubble are two other CBS drama series, Code Black and Elementary. It is unclear whether the network will impose formal cancellation on Wisdom of the Crowd which is presumed dead.

Scorpion centered on eccentric genius Walter O’Brien (Elyes Gabel) and his team of brilliant misfits who are the last line of defense against complex, high-tech threats of the modern age. Robert Patrick, Katharine McPhee, Eddie Kaye Thomas, Jadyn Wong, Ari Stidham and Riley B. Smith also star.

The series from CBS Television Studios, was executive produced by Alex Kurtzman, Roberto Orci, Nick Santora, Nicholas Wootton, Justin Lin, Heather Kadin, Scooter Braun and Walter O’Brien.