I honestly don't have too much to say about this issue, because David pretty efficiently moves us from Point A to Point B.
Captain America rebels against Miguel's attempt to imprison the Defenders and recruits Hercules in her effort to help them escape. (Unfortunately, David doesn't make it clear exactly why Roberta knew that Hercules would side with her or, conversely, why she felt like the Black Widow and Hercules wouldn't. Did she just figure that Herc would like a good fight?) Miguel's attempts to get her to revert to her Roberta persona fail, so he calls in her "husband" Henry to initiate a special override sequence. At that moment, Strange appears to pull Cap through a portal to her sanctum, only to discover a panicked Roberta wondering where she is and why she's dressed like Captain America. Meanwhile, Herc manages to escape with Hulk, Namor, and the Surfer. Shenanigans will definitely ensue.
If we were dealing with the usual Marvel Universe, I'd put money on the outcome of this series being Roberta finally unifying her personalities and joining the Defenders to fight Alchemax (much as Miguel originally did). But, part of the excitement of "Secret Wars" is the sense that all bets are off. It could be just as likely that Alchemax manages to re-assert control over her. Maybe they just kill her and get a new stooge. I guess we'll see!
*** (three of five stars)