VIDEO : Melissa Benoist Says Supergirl's Crossover Special Was Very Exciting

This week, a war of the worlds is coming to The CW. The network will kick-off its annual superhero crossover extravaganza on Monday when Supergirl airs, and the four-night event promises to leave fans stunned. Melissa Benoist's Supergirl will team up with the likes of Green Arrow, Flash, and White Canary to help stop a ...