Widening the gap, instead of bridging it...
Be warned that there are a lot of spoilers below, regarding both Dark Fury and The Chronicles of Riddick. I'm going to assume that you have at least seen Pitch Black.
Intended as a bridge, of sorts, between Pitch Black and The Chronicles of Riddick, Dark Fury does manage to set the stage for a number of upcoming plot points in TCOR, but at the same time, it actually undermines the credibility of a great deal of the film. Especially, it undermines the credibility of "Kyra" as an extension of the Jack that Pitch Black fans knew and loved.
Set almost immediately after the skiff launched from the Pitch Black planet, we see our three survivors -- Imam, Riddick and Jack -- caught and towed in by a merc ship. Although Riddick attempts to pass himself off as Johns, his voice print is on file and he's identified almost immediately. The ship is reeled in and the mercs on board attempt to capture Riddick, many of them dying in the process.
It is, in fact, a threat to Jack's life that ends up being the decisive factor in the battle, forcing Riddick to surrender. Despite his attempt to claim that she means nothing to him, he's unwilling to let her be harmed. This sets the stage for a fascinating interaction between the two characters during the rest of the film, as Jack's faith in -- and loyalty to -- Riddick only grows. When he is separated from Imam and Jack, she calls out a promise to him that she won't leave without him, a promise that she means wholeheartedly (it's not just teenage grandstanding).
Later, when Riddick and the others are thrown into a combat arena and pitted against an alien species, Jack's initiative keeps Riddick from getting killed, and she even helps him to his feet at one point. During their flight, she makes a determined effort to keep up, struggling against the physical limitations of her youth and smallness but not struggling against any lack of will or character. "I can keep up," she promises Riddick. "Maybe someday," he answers.
Still, he remains unable to simply abandon her, instructing Imam to get the two of them to the flight deck and then using his own blood to draw searchers away from them so they'll have a clear shot. Jack remains determined to help him, demanding from Imam how they can possibly do so if they just run away.
When Imam is knocked out and Jack is captured on the flight deck, it's Riddick's arrival that saves them; again, Riddick enters into battle to protect Jack as much as any other reason. The battle is wonderfully "choreographed," and pay special attention to where Jenner drops his gun...
When the denouement arrives, and Riddick is about to be killed by Antonia Chillingsworth, his captor, that gun is used against her. By Jack. A Jack who looks both stunned and a little horrified by what she's just done, but relieved that it's not Riddick who's been killed. She clings to the gun in the aftermath, going so far as to take it to bed with her in the escape craft. Imam worries that she's in danger of becoming like Riddick.
(As someone who has worked with war refugees, however, I disagree with that assessment. Her behavior during and after that plot point was more in keeping with someone doing an extraordinary thing to survive, and not with someone whose personality was going to be altered irrevocably by the act.)
Characterization is dead-on in all three performances, probably because all three of the original actors were used and, in spite of the limitations imposed by animation, the affectionate brother-sister chemistry between Vin Diesel's Riddick and Rhiana Griffith's Jack is palpable. This makes what then happens to the character of Jack afterwards an even harder, more implausible, and more bitter pill to swallow.
After all, in both Pitch Black and Dark Fury, Riddick had to abandon Jack at critical times, but in each case he returned to protect her and her faith in him was absolute. By the timeline established in The Chronicles of Riddick, though, she barely waited around on New Mecca after Riddick's departure before loss of faith and bitterness set in, and she took off in pursuit. Imam's remarks that "she never forgave (Riddick) for abandoning her when she needed (him) most" completely contradict everything we'd ever seen in Jack's character. Even when she'd truly believed that he'd abandoned her for good, in the cave on the Pitch Black planet, there was no bitterness on display. I also find it incredibly unrealistic that Imam wouldn't have been able to find and bring her back, given his devotion and concern for her in both Pitch Black and Dark Fury.
Worse yet is the person Jack has become. Kyra is the antithesis of Jack in virtually every way. She blames Riddick for her own actions, for example. And worst of all, where Jack would have had to have been dragged, kicking and screaming, into the Necromonger ship, Kyra simply ran for it, not even bothering to check and make sure Riddick wasn't okay. Maybe five years can change a person a great deal, but if they wanted Jack's fans to buy that she could have turned into that, they needed Rhiana in the part more than ever in order to have a prayer of selling it. It's also incredibly hard to conceive how a girl who already knew the value of protective coloration -- namely, disguising herself as a boy -- would advertise her femininity in a prison as tough as Crematoria, where looking like a supermodel would be an invitation for gang-rape, and where all that hair would be a weapon against her in combat.
While not perfect -- Dark Fury is as bad as The Chronicles of Riddick in terms of trivializing Carolyn Fry's sacrifice in the first film, worsening it a bit by having the injuries Riddick had sustained, and which had forced Fry to sacrifice her life rescuing him, no longer existent -- I would say that Dark Fury is definitely superior to The Chronicles of Riddick, especially in the way it treats the original characters with a respect entirely lacking in TCOR. They're multi-dimensional human beings in Dark Fury, not mere plot devices with pulses, caricatures of their former selves, which makes it ironic that this is the cartoon and TCOR is not.
If you love Vin Diesel, this will be a fantastic addition to your collection, along with going to see The Chronicles of Riddick. If you love Imam, Jack, Rhiana Griffith, Keith David, or Pitch Black, you might want to seriously consider skipping the new movie altogether and buying this instead.