STEP UP star JENNA DEWAN-TATUM is joining the star-studded cast of upcoming U.S. drama Supergirl. The actress is set to play Lucy Lane, the sister to Superman's love interest Lois Lane. The programme also stars Melissa Benoist as the titular superhero, as well as Calista Flockhart, David Harewood, Chyler Leigh and Laura Benanti, among others.