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 tu 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 tu want to see all of the things 4Kids did to butcher Sonic X, look here -> link

The main differences are listed below:
SPOILER ALERT!
1. Characers curse every now and then
2. Scenes are much más emotional, mainly episodes 25, 26, 51, 52, 68, 69-78.
3. The original and beautiful Japanese música score is intact.
4. The ending of episode 77 WILL make tu cry...
5. The episodes are 2 to 5 minutos longer than the American version.