Professor Spencer Smythe was a robotics genius who created the first Spider-Slayer robot for J. Jonah Jameson. The robot failed to capture Spider-Man, but Smythe would continue to build bigger and better Spider-Slayer robots. Sadly, the radioactive elements he used in his robots would poison his body and mind. Insane and dying, Smythe made one last attempt at revenge against both Spider-Man and Jameson. His last attempt, like his robots, failed.
While Smythe is an important villain in the history of Spider-Man, he's another average guy in a lab coat. It doesn't make a visually-interesting Minimate. But since I made a Spider-Slayer robot, I felt I needed to make the robot's creator as well.