Crossovers in the HD Universe

 are missions which involve multiple Protagonists to appear together. The most popular crossover is thet Impossible Trinity in IV, TLAD, and TBoGT. Grand Theft Auto: Chinatown Wars doesn't includes crossovers. In Grand Theft Auto V you will be able to play with the three protagonists in the same mission, teoretically being a crossover, also DLCs are confirmed.