You can go back to issue 1 and see hints.
Once the dust has settled, an alternate version of Apocalypse and his Four Horsemen appear.
Spider-Woman (Jessica Drew)
She is trained and mentored by Taskmaster , who trains her in many martial disciplines and more than seven different fighting styles out of his own "arsenal".
Description: During the fight Mandrill gets close enough to Jessica and controls her into attacking Spider-Man.