The Blob-scure Side (S04E09)

Léo is feeling more and more useless as part of the Squad, even though he does want to be of help. So, in a plan to make the team look good, he decides to become the Squad´s nemesis. Magalie thinks Charles has gone too far with his serum. She decides to turn to the Paranormal Monster Council in an attempt to convince her friend to put a stop to his dangerous research. But it might be too late-Charles has already tested the serum… on himself. (TFO)