The WB is the now-defunct Warner Brothers Television network which began broadcasting in 1995. Its most successful shows included Buffy the Vampire Slayer, Angel, Ally McBeal, Rosewell, Felicity, Dawson's Creek, Charmed, the Gilmore Girls and Smallville.
Supernatural premiered on The WB in the fall season of 2005. In mid-2006, The WB merged with the UPN network to form The CW. Like many actors Jared and Jensen both appeared on more than one WB show. Jensen had roles in Dawson's Creek and Smallville, while Jared got his start on The Gilmore Girls.