There has been an air of mystery around Staz Nair's William Dey throughout season 5 of 'Supergirl'. However, things may change in the upcoming episode, 'In Plain Sight'. The CW released the official synopsis for the episode and according to it, we may see Kara (Melissa Benoist) dig deep into Williams's activities and uncover something totally unexpected. 

The synopsis reads: Kara's investigation into William Dey's "criminal" activities results in the shocking revelation he is not who she thinks; the conflict between Malefic and J'onn J'onzz reaches a boiling point. David McWhirter directed the episode written by Jay Faerber & Jess Kardos."

William was introduced in season 5 premiere as the loyal associate to new CatCo owner Andrea Rojas (Julie Gonzalo), who acquired the company from Lena Luthor (Katie McGrath), who has her own plans to fix humanity. Three episodes of the Girl of Steel has seen formidable metas, the darker side of Lena and a strained, violent relationship between J'onn J'onzz (David Harewood) and his brother, Malefic. 

The J'onn-Malefic plotline has been a major highlight and it's interesting how it all ends for the two brothers. Call it a classic case of misunderstanding. Each of them has an outright reason to be angry and vengeance seems to be the route Malefic has taken to.

Meanwhile, there is also this unanswered question about the shadowy figure that killed Caroline O' Connor in the previous episode. The theory right now is that the mysterious Leviathan is behind it. Does this mean there'll be more light shed on the organization in the next episode? Only time will tell

Airing Sundays at 9 p.m. ET/PT on The CW, 'Supergirl' stars Melissa Benoist as Kara Danvers, David Harewood as Martian Manhunter, Mehcad Brooks as Jimmy Olsen and Chyler Leigh as Alex Danvers.