Despite a slower than expected start at the box office, the film did fairly well when considering its budget was only $30 million. Couple that with an overwhelmingly positive critical reception, and it’s easy to see why the Weinsteins and Co. signed off another installment.
Since the fourth dimension is time, I’m assuming Piranha 4D will involve the piranhas taking control of some sort of water-based time machine and traveling back to the Old West. Unless, of course, they end up naming it Piranha 3D Part 2, which would just be stupid. (Cinema Blend)