This trade collects Issues 7-11 of Supergirl as well as material from Batgirl Annual #1.
First up is "World's Finest" (Batgirl Annual) in which Batgirl and Supergirl meet and Supergirl invites Batgirl to help her break into Cadmus and rescue a young woman with mysterious powers. This story is okay, but its hurt by being a bit too overzealous in its attempts to be cool and hip and with a throw away line of Supergirl observing, "I'm a Super Strong illegal alien. There are lots of Americans who will take any excuse to hate people like me," as her explanation for why she wants Batgirl's help. She's not illegal if she's working for a government agency and it has nothing to do with why she wants Batgirl's help. We also get a recurring theme in the DC Universe that we don't ask Batman for help for fear he'll take over and do things "his way," as if he has time to do all that. The story is okay and sets the stage for later events, but there's some dumb stuff in it.
Next up is "Mission: Mind" which finds Supergirl traveling through the mind of Lar-On, a Kryptonian afflicted with werewolve symptoms. To find out what's going on, Supergirl journeys to his mind. It's a very touchy feely sort of psychological story, but it's also really imaginative in its content and art.
"Family of Tomorrow" features a brief battle with a baddie determined to stop Kara for something she hasn't done and then she gets to hang out with Clark and the rest of the Super Family and learn some information he's gathered in other books including his recent reboot. This is a lot of fun. I love how the Super Family guest stars in so many books. They make every book they appear in better. A very nice one shot.
Finally, we have the titular "Escape from the Phantom Zone," and it's okay. Despite the presence of Batgirl, this is nothing special storywise, although there is some impressive art. Throughout much of the story, Batgirl takes the lead as Supergirl doesn't have powers, but in the end, Supergirl gets an opportunity to show the type of hero she is and just like in the first volume, it's epic, brave, and a very different approach than most other heroes would take.
Overall, this book isn't great, but it's lot more good than it is bad. The art is impressive and the character is compelling . I wish we'd seen more of Jeremiah and Eliza in this book as theyw ere so great in the last one, but this book was an enjoyable read with an admirable and noble lead.