|**Factor Three Chronology**||||https://en.wikipedia.org/wiki/Factor_Three|

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|Marvel Age Introductions by On-Sale Date|||||
|1966|NOV 3|XMN028|The X-Men|[XMROS•Professor X • Angel • Beast • Cyclops • Iceman • Marvel Girl] [The Mimic][Factor Three] [Banshee] [Ogre]|
|1967|APR 11|XMN033|The X-Men|[PXMROS•rofessor X • Angel • Beast • Cyclops • Iceman • Marvel Girl] xo[Doctor Strange][The Juggernaut] |
|1967|JUN 8|XMN035|The X-Men|[XMROS• • Beast • Cyclops • Iceman • Marvel Girl] [Banshee][Changeling] xo[Amazing Spider-Man]|
|1967|JUL 11|XMN036|The X-Men|[XMROS•Angel • Beast • Cyclops • Iceman • Marvel Girl] []|
|1967|AUG 8|XMN037|The X-Men|[XMROS•Professor X • Angel • Beast • Cyclops • Iceman • Marvel Girl] [Banshee][Mutant Master]|
|1967|SEP 7|XMN038A|The X-Men|[XMROS•Professor X • Angel • Beast • Cyclops • Iceman • Marvel Girl] []|
|1967|SEP 7|XMN038B|The X-Men|[Origins of the X-Men • Cyclops]|
|1967|OCT 10|XMN039A|The X-Men|[XMROS•Professor X • Angel • Beast • Cyclops • Iceman • Marvel Girl] [Banshee][Living Diamond] [New Costumes]|
|1967|OCT 10|XMN039B|The X-Men|[Origins of the X-Men • Cyclops]|