Season 4
Episodes
1 Perfect Day Jul 7, 2007 
2 Divided We Stand Jul 14, 2007 
3 Don't Drink the Water Jul 21, 2007 
4 Big Fat Alien Wedding Jul 28, 2007 
5 Secret of the Omnitrix (1) Aug 4, 2007 
6 Secret of the Omnitrix (2) Aug 4, 2007 
7 Secret of the Omnitrix (3) Aug 4, 2007 
8 Ben 4 Good Buddy Sep 22, 2007 
9 Ready to Rumble Sep 29, 2007 
10 Ken 10 Oct 6, 2007 
11 Ben 10 vs. Negative 10 (1) Mar 9, 2008 
12 Ben 10 vs. Negative 10 (2) Mar 9, 2008 
13 Goodbye and Good Riddance Apr 15, 2008