Leopoldon is Spiderman's mega robot. After Toei had enough success (or fun) with GoRanger and JackQ, they acquired the rights to Marvel characters in Japan. With that they made a Japanese show of Spiderman, were Spidey got his Spider powers from aliens and was given a massive spaceship to command called the Marvellor. It was essentially a power rangers show, but only with Spiderman (as far as I have watched [ep. 3]) and he jumps in and drives the robot.
The next Sentai show (Battle Fever) was inspired by Spiderman and Lepoldon was the first of the Giant robot suits that Toei made. GoRanger and JackQ only had vehicles for their characters. I believe that the original toy was recoloured and released in blue for those outside of Japan, sans Spiderman. I think in the shogun warriors line, but I haven't been able to successfully find a link yet.
Apparently the Leopardon suit was really hard for the actor to move in and got so damaged/stolen (conflicting reports) that they had to resort to using stock footage of its attacks and rarely did you see it interacting with his enemies. I love it when there is a good story behind a figure!
Quite a few eps of Spiderman are on youtube (YAY) Here's a link to the first one:
http://www.youtube.com/watch?v=MMDZ1c3VJ6w