The 4kids version of Sonic X is terrible compared to the Japanese version, they left out alot of emotion and content that made the story even better!
If you have never seen the ORIGINAL and UNCUT version of Sonic X go here to watch any episode in high quality with English subtitles -> link
If you want to see all of the things 4Kids did to butcher Sonic X, look here -> link
The main differences are listed below:
1. Characers curse every now and then
2. Scenes are much more emotional, mainly episodes 25, 26, 51, 52, 68, 69-78.
3. The original and beautiful Japanese music score is intact.
4. The ending of episode 77 WILL make you cry...
5. The episodes are 2 to 5 minutes longer than the American version.