While sci-fi as a genre generally conjures images of big-budget spectacles and grand uses of special effects, some series manage to achieve greatness without a lot of money behind them. Although science fiction can benefit from large-scale endeavors and huge finances backing them up, at its core, this is a genre that’s more concerned with ideas than it is with awe-inspiring special effects. While big budgets can elevate already great stories, they would be nothing without strong writing, performances, and thought-provoking thematic depth.