X-Men #5 (9.4)

1st appearance of Maverick, later becomes Agent Zero

2nd appearance and 1st full cover appearance of Omega Red

Wolverine is captured by Omega Red and Fenris so they can probe his memories to find a Carbonadium Synthesizer that has been lost for 30 years. Wolvie escapes with the help of an old friend. The X-Men come after him as well.