Spinoffs. Reboots. Sequels. Reimaginings. Call them what you want, we wouldn't recognize sci-fi TV without them. Many of our favorite sci-fi TV shows have inspired new series—which in some cases have been even better than the originals.
Since it can be pretty tricky to keep track of what shows inspired which other shows and for how many episodes, here are 14 graphs that chart all that information so you don't have to.