The Science Club is the main club of the show, it is the grouph that consists of Professor Z, Josie Trent, Corrine Baxter, Marshall Wheeler, Lucas Randall and Vaughn Pearson. The Science Club is where the group go when they all need to be together to figure things out.
Before the series starts, the science club only contained Professor Middleton, Marshall, Corrine and Lucas. Then after Middleton's disappearence, Z is hired.
In his first time teaching the club, Josie barges in after being startled by the old lady and they have a quick banter and then Josie is asked to join the club.