|**The Frightful Four Chronology**||||https://en.wikipedia.org/wiki/Frightful_Four|

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|Marvel Age Introductions by On-Sale Date|||||
|1964|DEC 10|FAN036|Fantastic Four|[FFROS•Human Torch • Invisible Girl • Mister Fantastic • The Thing] [The Inhumans•INHROS•**INTRO**Medusa][**INTRO**F4ROS•Frightful Four • Medusa • Paste-Pot Pete(Trapster) • The Sandman • The Wizard][The Avengers•AVNROS•Captain America • Giant-Man • Iron Man • Mighty Thor • The Wasp] • [The X-Men•XMROS•Professor X • Cyclops • Angel • Beast • Iceman • Marvel Girl • Amazing Spider-Man]|
|1965|FEB 11|FAN038|Fantastic Four|[FFROS•Human Torch • Invisible Girl • Mister Fantastic • The Thing] [F4ROS•Frightful Four • Medusa • Paste-Pot Pete(Trapster) • The Sandman • The Wizard]|
|1965|MAR 4|JIM116A|Journey into Mystery|[Mighty Thor] xo[The Avengers•AVNROS•Captain America • Giant-Man • Iron Man • The Wasp] • Daredevil][Loki][Enchantress][The Executioner][F4ROS•Frightful Four • Medusa • Paste-Pot Pete(Trapster) • The Sandman • The Wizard]|
|1965|MAR 11|FAN039|Fantastic Four|[FFROS•Human Torch • Invisible Girl • Mister Fantastic • The Thing] xo[Daredevil] xo[Doctor Doom][F4ROS•Frightful Four • Medusa • Paste-Pot Pete(Trapster) • The Sandman • The Wizard]|
|1965|MAY 11|FAN041|Fantastic Four|[FFROS•Human Torch • Invisible Girl • Mister Fantastic • The Thing] xo[F4ROS•Frightful Four • Medusa • Paste-Pot Pete(Trapster) • The Sandman • The Wizard]|
|1965|JUN 8|FAN042|Fantastic Four|[FFROS•Human Torch • Invisible Girl • Mister Fantastic • The Thing] [F4ROS•Frightful Four • Medusa • Paste-Pot Pete(Trapster) • The Sandman • The Wizard]|
|1965|JUL 8|FAN043|Fantastic Four|[FFROS•Human Torch • Invisible Girl • Mister Fantastic • The Thing] [F4ROS•Frightful Four • Medusa • Paste-Pot Pete(Trapster) • The Sandman • The Wizard] • Doctor Doom]|
|1968|APR 9|MSH015|Marvel Super-Heroes|[The Inhumans•INHROS•Black Bolt •  • Medusa • ][F4ROS•Frightful Four • Medusa • Paste-Pot Pete(Trapster) • The Sandman • The Wizard][Maximus]|
|1969|OCT 14|FAN094|Fantastic Four|[FFROS•Human Torch • Invisible Girl • Mister Fantastic • The Thing] xo[Crystal • Medusa • ][Agatha Harkness] [Ebony]@[F4ROS•Frightful Four • Medusa • Paste-Pot Pete(Trapster) • The Sandman • The Wizard]|