Left 4 Dead developer Turtle Rock's monster-hunting game Evolve is now considered a "permanent" franchise, according to Take-Two Interactive CEO Strauss Zelnick. Others that Zelnick has previously referred to as "permanent" include heavyweights like Grand Theft Auto, Red Dead Redemption, BioShock, Civilization, and and Borderlands.Zelnick made his comments this week as part of the 43rd Annual Technology, Media & Telecom Conference in New York.