EARTH-20051 (Marvel Adventures)
The Marvel Adventures universe was designated Earth-20051 in Marvel Adventures: Fantastic Four, but has not yet been validated in other books in this imprint.
Dr. Betty (Marvel Adventures, Fantastic Four foe) - by Grendel Prime
Geoportal (teleportation device) - by AvatarWarlord72
Intello (Marvel Adventures, Spider-Man foe) - by Grendel Prime
Josh ?? (Marvel Adventures, Fantastic Four foe)
Nekal-Gehep (Fantastic Four foe) - by AvatarWarlord72
Noriyaki, Dr. Ito (Geoportal user)
Noriyaki, Oji (Geoportal user)
Orrgo (Fantastic Four foe) - by Grendel Prime
Probability Engine (Reed Richards invention) - by Grendel Prime
Quantum Converter (Marvel Adventures, Mr. Fantastic invention) - by AvatarWarlord72
Rama-Tut (rogue Chronomonitor, Marvel Adventures Fantastic Four foe)
Seeker (Fantastic Four foe) - by Grendel Prime
Serpent Society (Avengers foes) - by SQUEAK
Serpent Sovereign (Serpent Society leader)
Serpent Supreme (Serpent Society leader)
Silver Sentinel Patrol (Marvel Adventures, Fantastic Four foes)
Storm, Chili (Fantastic Four character) - by Grendel Prime
The Street (Fantastic Four foe) - by AvatarWarlord72
Techno (Fantastic Four foe) - by Grendel Prime
Zircon, Thomas (Fantastic Four character)