Before Heisenberg, before he was the one who knocked, Walter White was in on the ground floor of Gray Matter Technologies. Due to some as of yet unrevealed circumstances, Walter bailed on his partners Gretchen and Elliot, selling his share for five-thousand bucks. As he explained to Jesse, the company went on to be worth over two-billion dollars. It could be argued that the dark, bitter jealousy he felt was the driving force that created the Heisenberg persona, making it prime material for a TV series. Over the course of this new series, it could detail Walter's early life and partnerships with Gretchen and Elliot, as well as what lead to his eventual split from them. Imagine for just a moment how fantastic it would be to show Walter teaching a young Jesse Pinkman inside chemistry, handing him the very paper scribbled with "Ridiculous! Apply yourself" that Jesse finds in his trunk during the episode "Cancer Man". There's so many little things here that could give wonderful insight into the man that he became, ripe with potential foreshadowing.
