Uncanny X-Men (1963) #166

Part 5 of 6. Story by Chris Claremont. Art by Paul Smith and Bob Wiacek.

It’s the final battle between the sinister Brood and the Uncanny X-Men. But when the Earth heroes learn a startling secret about their mentor, Professor X, they discover that they may already be too late to save their homeworld.

First appearance of Lockheed. Newsstand edition.