Who are the people that Max and the Flock travel with to Antarctica?

In "Angel," the seventh book of the Maximum Ride series, Max and the Flock travel to Antarctica with Dr. Martinez, their ally, and a few other characters, including the scientist and environmentalist, Dr. Brigid. Their journey is aimed at uncovering secrets related to the experiments conducted by the School and the origins of the genetically modified Erasers. Throughout the adventure, they face various challenges and confrontations with enemies linked to their past.