Produced by Warner Premiere, DC Entertainment and Warner Bros. Animation, "Superman/Batman: Apocalypse" will be distributed by Warner Home Video on September 28, 2010.The animated clip depicts the harried first few minutes of time on Earth for Kara, a Kryptonian cousin of Superman who has not yet understood or harnessed her powers.
Based on the DC Comics series/graphic novel "Superman/Batman: Supergirl" by Jeph Loeb, Michael Turner & Peter Steigerwald, "Superman/Batman: Apocalypse" is produced by animation legend Bruce Timm and directed by Lauren Montgomery (Justice League: Crisis on Two Earths) from a script by Academy Award-nominated screenwriter Tab Murphy (Gorillas in the Mist).
The above clip seems to take place shortly after the one below released a month ago: