Justice League Unlimited, Season 1 (aka Justice League, Season 3)
Originally airing on Cartoon Network (in the US) from July 2004 to July 2005.

SPECS IN BRIEF:
M4V files for playback in iTunes
V: 1280x720 23.98fps h.264 @ 860-1781 Kbps
A: 160 Kbps 2.0 AAC / 96 Kbps 2.0 AAC (commentaries)
S: English & English SDH
C: 5 (Named)
D: ~22 minutes

SOURCES:
Justice League Season 3 720p WEB-DL AC3 2.0
Justice League Season 4 720p WEB-DL AC3 2.0
(Took 25fps source & reconformed to 23.98fps; no jitter or audio sync issues)

NOTES:
Since these are sourced from Warner Bros. Animation WEB-DLs, no 5.1 tracks.

PLAYBACK:
Encoded & tagged for iTunes and Apple devices (iPad, iPhone 4, etc) that can handle HD video, including *all* versions -- 2007, 2010, 2012 -- of the AppleTV set top box.

For those importing into iTunes, these are tagged to sort as "Justice League, Season 3"

EPISODE LIST:
  1. Initiation
  2. For the Man Who Has Everything
  3. Kid Stuff
  4. Hawk and Dove
  5. This Little Piggy (with audio commentary)
  6. Fearful Symmetry
  7. The Greatest Story Never Told
  8. The Return (with audio commentary)
  9. Ultimatum
 10. Dark Heart
 11. Wake the Dead
 12. The Once and Future Thing, Part One: Weird Western Tales
 13. The Once and Future Thing, Part Two: Time, Warped
 14. The Cat and the Canary
 15. The Ties That Bind
 16. The Doomsday Sanction
 17. Task Force X
 18. The Balance
 19. Double Date
 20. Clash
 21. Hunter's Moon
 22. Question Authority
 23. Flashpoint
 24. Panic in the Sky
 25. Divided We Fall
 26. Epilogue

SCREENSHOTS: 
http://i.imgur.com/58huL.jpg 
http://i.imgur.com/rFwOP.png 
http://i.imgur.com/SM7jG.png 
http://i.imgur.com/Yz6D7.png