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.
Bebop (LMD, She-Hulk/Spider-Man/Tigra ally) - by Grendel Prime
Bucky of Earth-20051 (James Buchanan Barnes, former partner of Captain America) - by Mike Castle
Burll (Fantastic Four character)
Collective (Marvel Adventures, Fantastic Four foe) - by Grendel Prime
Dimri (Watcher, Fantastic Four character)
Dr. Betty (Marvel Adventures, Fantastic Four foe) - by Grendel Prime
Geoportal (teleportation device) - by AvatarWarlord72
ice worms of Earth-20051 (Fantastic Four story)
Intello (Marvel Adventures, Spider-Man foe) - by Grendel Prime
Josh ?? (Marvel Adventures, Fantastic Four foe)
Kurrgo (Fantastic Four character)
Lemmy (Skrull, Fantastic Four character)
Militia Machines (Helmut Zemo weapons)
Mr. Fish (Fantastic Four foe) - by Grendel Prime
Namora (Agents of Atlas) - by MarvellousLuke
Nekal-Gehep (Fantastic Four foe) - by AvatarWarlord72
Noriyaki, Dr. Ito (Geoportal user)
Noriyaki, Oji (Geoportal user)
Null the Living Darkness (Fantastic Four foe) - by Grendel Prime
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)
Rick Donalds (fast food restaurant)
Seeker (Fantastic Four foe) - by Grendel Prime
Serchev, Vassily (Fantastic Four ally) - 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
Teleportation Projectors (Mr. Fantastic invention) - by Grendel Prime
Terminus of Earth-20051 (Fantastic Four foe)
Terror Birds (Fantastic Four/Thor foes) - by Grendel Prime
Ultimate Nullifier (Avengers/Galactus item) - by Grendel Prime
War-Walker Omega (Baron Zemo weapon) - by Grendel Prime
Zircon, Thomas (Fantastic Four character)