CBS | 10:00 pm

The forecast is cloudy in more ways than one for the residents of an Irish village in "Sly and the Family Stone." The "Sly" in this case is Sylvester (Ari Stidham), who’s overseas with the rest of Team Scorpion to mark one year since the passing of his beloved, and Walter’s (Elyes Gabel) sister, Megan. While there, they discover a lake has generated a poisonous cloud that could kill everyone nearby. Scott Porter returns as Tim Armstrong.