Fresh off the success of STXfilms' The Upside, which grossed more than $100 million at the domestic box office, Kevin Hart has signed on to produce and star in the studio's high-concept superhero comedy Night Wolf, Collider has learned. STX acquired Night Wolf as a pitch from Detective Pikachu screenwriters Dan Hernandez and Benji Samit. The premise, which has drawn comparisons to Meet the Parents, finds Hart meeting his future father-in-law for the first time, only to discover he is secretly the superhero known as the Night Wolf. That's a pretty clever pitch, as it'…