X-Men # 128 CGC 9.6 White pages (Marvel, 1979) John Byrne art
"The Action of the Tiger!". Part 3 of 3. Story by Chris Claremont and John Byrne. Art by John Byrne and Terry Austin. Cover by George Perez and Terry Austin. In order to defeat the reality warping mutant Proteus, one X-Men will have to commit the ultimate sin - murder! !