Ghostbusters 101 #1

Before becoming renowned for their supernatural pursuits, the original Ghostbusters team primarily served as educators. Now, they've resolved to impart their expertise once more. However, their inaugural group of students, while exploring the firehouse, inadvertently triggers the convergence of two distinct universes. As a result, Venkman, Stantz, Zeddemore, and Spengler are confronted with an immense challenge.