Several SPOILERS here.
Well, the ride had to end sometime. JUSTICE LEAGUE UNLIMITED: THE COMPLETE SECOND SEASON is the culminating season to this excellent animated series and serves to put a capper on the DC Animated Universe, which consists of BATMAN: T.A.S., SUPERMAN: T.A.S., BATMAN BEYOND, STATIC SHOCK, and ZETA PROJECT. While the current THE BATMAN and LEGION OF SUPER-HEROES continue the tradition somewhat, these new shows do not follow the same continuity.
This "second" season is, technically, the third season of JLU (or, even more comprehensively, the fifth season of JUSTICE LEAGUE) as JLU's "first" season dvd set actually contains Seasons 1 and 2. Hopefully, that wasn't too confusing to follow. Anyway, this dvd set offers the final 13 episodes in glorious wide screen and continues to showcase lesser lights from its expanded superhero roster (Hawkman in two episodes, the Warlord, Deadman, Green Arrow, the Huntress, etc.) as they are teamed up with several of the original seven founders.
Several episodes pay homage to CHALLENGE OF THE SUPERFRIENDS by updating the Legion of Doom, a haphazard collection of supervillains put together to combat the JLU, which then becomes the season's major story arc. Yes, there's even a Hall of Doom here. And, when we aren't privy to Gorilla Grodd and Lex Luthor engaging in power plays as they vie for the leadership of the Legion, we get to see highly diverting, self-contained episodes such as "Chaos at the Earth's Core" (I used to collect the Warlord), "Flash and Substance" (featuring a Bats/Flash team-up), "Patriot Act" (which salutes the Seven Soldiers of Victory and, in a way, resuscitates the defunct Cadmus Project), and "Far from Home" (on her 21st birthday, Supergirl, with GL and Green Arrow are transported to the 31st Century and meet the Legion of Super-Heroes).
Meanwhile, the superb "The Great Brain Robbery" (which has Luthor and Wally swapping minds) is a favorite Legion of Doom episode of mine. The Legion of Doom storyline, by the way, climaxes with the last two episodes, "Alive" and "Destroyer," as the writers throw out all the stops and bring back powerhouse villains Brainiac and Darkseid. By the way, the monumental clash between Superman and Darkseid is a must-see.
In my opinion, there isn't a lot of bad moments in this season (or in the entire series, come to think of it). Like a reviewer already mentioned, the disappearance of the Martian Manhunter for a significant portion of the season and the somewhat inconclusive resolution to Shayera and GL's often turbulent relationship are two which fall more in the negative category. And whatever happened with Batman and Wonder Woman's flirtations? Also, I wish the Blue Devil or Blue Beetle had been featured in a show (after all, Ted Kord's best bud, Booster Gold, starred in his own episode). On the positive side, the stories and the animation continue to be amazing. The stellar voice actors maintain their high quality work as they consistently add depth and resonance to their characters. Much as the Batman, as voiced by the iconic Kevin Conroy, and the Joker, by the versatile Mark Hamill, have been firmly embedded in my brain, so, too, now, are Michael Rosenbaum's Flash, Phil LaMarr's Jon Stewart, Maria Canal's Hawkgirl, Carl Lumbly's J'onn J'onzz, Susan Eisenberg's Wonder Woman, and Clancy Brown's Lex Luthor. George Newbern ends up being pretty good as the Man of Steel, but I still prefer Tim Daly. Sorry.
What started out, innocently enough, in 1992's definitive BATMAN: THE ANIMATED SERIES has, over the course of 14 years, expanded into an animated universe in which so many significant DC costumed players have made an appearance. It's been such a sweet ride. I just want to state that never in my wildest dreams did I expect the JUSTICE LEAGUE (UNLIMITED) to be this good and this addictive. Thinking back, I probably was basing my expectations on the fun but ultimately shallow and juvenile Hanna-Barbera's SUPERFRIENDS. This current reincarnation offers so much more in terms of depth, emotion, story, scope, and creativity. The characters in JL and JLU are multi-layered, have inter-personal exchanges and conflicts, and do change and grow like real people (Hawkgirl being a prime example); the writers (Paul Dini, Bruce Timm, etc.) did such a fantastic job of making the viewers care for their product, the sum of 91 sincerely produced episodes. I'll miss the Justice League on television very, very much. Just thank goodness for dvds, huh?