Uncanny X-Men Vol.1 #44
The Uncanny X-Men have gone down to defeat at the hands of the Brotherhood of Evil Mutants! But auspiciously for the young mutants, Quicksilver convinces Magneto to spare their lives and keep Professor X's charges as prisoners instead! While in captivity the resourceful Angel escapes from his cage!
Printed: May 1968
Writers: Roy Thomas and Gary Friedrich
Art: Don Heck, Werner Roth, and John Tartaglione
Cover: Don Heck, John Tartaglione, and Marie Severin