Elseworlds, the 3-night crossover event begins Sunday, December 9 on The CW! Stream free next day on The CW App. SUBSCRIBE: http://go.cwtv.com/YTSubscribe About The CW: Official YouTube Channel for the CW Television Network featuring the hit series Riverdale, as well as Black Lightning, The Flash, Arrow, Supergirl, DC's Legends of Tomorrow, Supernatural, Jane The Virgin, Crazy Ex-Girlfriend, The 100, iZombie, Dynasty.