Season 4 aired between 14 Jul 2007 and 15 Apr 2008, 13 episodes.
Episodes
E01
Perfect Day
14 Jul 2007
E02
Divided We Stand
19 Jul 2007
E03
Don't Drink the Water
26 Jul 2007
E04
Big Fat Alien Wedding
02 Aug 2007
E05
Ben 4 Good Buddy
22 Sep 2007
E06
Ready to Rumble
29 Sep 2007
E07
Ken 10
06 Oct 2007
E08
Ben 10 vs. Negative 10 (1)
09 Mar 2008
E09
Ben 10 vs. Negative 10 (2)
09 Mar 2008
E10
Goodbye and Good Riddance
04 Apr 2008
E11
Secret of the Omnitrix, Part 1
09 Mar 2008
E12
Secret of the Omnitrix, Part 2
09 Mar 2008
E13
Secret of the Omnitrix, Part 3
15 Apr 2008