-The serum. Had the formula changed? The first time it is made, it turns Jekyll into Hyde. Later, it splits them and splits EQ from Regina. If this is the case, then I would like to have seen confirmation that the serum formula had changed. Was it mentioned at the end of 5B? I can’t remember. Could someone remind me?
This is shown and explained in depth in “An Untold Story”. Jekyll added a plant to the serum, so that it would split him from Hyde.