TV showrunner and creator Eric Kripke had a plan: five seasons of superhuman feats, fantastical mysteries and men with chiselled jaws going toe-to-toe in some of the best TV of the 21st century. There's only one problem. That never happened. That's because when he eventually decided it was time to finish his series Supernatural, the studio had other plans. Instead, another showrunner came on, and it continued for 10 more seasons in a run that was occasionally criticized for gilding the lily if you're being nice — and jumping the shark if you're not. So as his current show, the...