There aren't any other cartoon series that I'm aware of that start with "Ultimate" in their title.
However, there are other cartoon series that could be considered "ultimate" in some way, such as:
* "Ultimate Muscle": A Japanese anime about a young boy who becomes a professional wrestler.
* "Ultimate Gravity": An Italian animated series about a group of teenagers who can control gravity.
* "Ultimate Fantastic Four": A comic book series that was later adapted into an animated film.
Let me know if you have any other questions!