Uncanny X-Men #54

Cyclops wakes up in a museum's Egyptian exhibit, accused of murder and facing a police officer's gun. His memory fuzzy, he recalls how it started a few days earlier when he and the X-Men visited his brother, Alex. They discover Alex missing and track him to the museum, where he's about to be sacrificed by the Living Pharaoh. The X-Men intervene, but the Pharaoh escapes. Cyclops reveals his identity to Alex, and they are ambushed by the Pharaoh. When Cyclops regains consciousness, he's accused of the Pharaoh's murder. Believing his brother might be involved, Cyclops escapes from the police and confronts the Pharaoh again, who claims immortality and vows to kill him.

Key Details:
- 1st app and origin of Alex Summers (becomes Havok in issue #56)
- 1st app of the Living Pharaoh/Monolith
- Origin of Angel begins in backup stories