All of the Star Trek show, especially TNG, Voyager and Emterprise, because I've watched them so many times when I was a kid at my grandparent's house.
I was fascinated by the various captains. They were always so smart, capable, full of resources, curious, charismatic and generally great leaders, mostly coherent with their morals. They were basically badass scientist explorers and I identified so much with them without even realizing it.
Now whenever I find myself in any leadership position, I ask myself what they would do. I could choose to be logical and intellectual like Picard, empathetic like Janeway or brave like Archer. This shaped me more than I could ever imagine.