Worlds collide as your favorite Ghostbusters, from all three movies, meet for the first time! It's the biggest crossover since they crossed the streams! Before they began investigating the supernatural, most of the original Ghostbusters were teachers... and they've decided it's time they start sharing their knowledge again. But when their first batch of students start poking around the firehouse and accidentally set in motion the merging of two universes (it's easier than you'd think) Venkman, Stantz, Zeddemore, and Spengler will need all the help they can get to put things right! And who do you think will Answer The Call? (If you guessed Holtzmann, Yates, Tolan, and Gilbert... you get a gold star!) It's a brand new inter-dimensional meeting of the minds!