It was the final day of San Diego Comic-Con, and the cosplayers went out in style. Day 4's round-up includes the uncanny Gru above, some giant Lego superheroes, a stunning Princess Mononoke, Optimus Prime in his formal wear, and much more (including, uh, Darth Trump was there, too). Check out io9's final San Diego Comic-Con cosplay video of 2017, and we’ll see you next year!