| Earth: Ungrounded
|
Ungrounded #1 |
| Earth: Unicycle Lawman
|
Excalibur #50 |
| Earth: United Earth Fleet
|
Star Trek - Strange New Worlds, 'Tomorrow and Tomorrow and Tomorrow' |
| Earth: United States lost the Revolution
|
Futurama, 'All the President's Heads' |
| Earth: United States of Earth
|
Jonny Quest Special |
| Earth: United Super-Heroes of America
|
Sentinels #273 |
| Earth: Unity
|
Hawk and Dove Annual #2 |
| Earth: Universe Alpha
|
+Universe Alpha #1 |
| Earth: Universe Rex
|
X-Men Millennial Visions 2000 |
| Earth: Universe destroyed by Nekron
|
Star Trek/Green Lantern #1 |
| Earth: Universe-2
|
Challengers of the Fantastic #1 |
| Earth: Unknown Superman
|
All Star Superman #2 |
| Earth: Unpowered Captain Canuck
|
Captain Canuck: Unholy War #1 |
| Earth: Unpowered Fantastic Four
|
Unstable Molecules #1 |
| Earth: Unstoppable
|
Stormchasers #1 |
| Earth: Untouchables LSH
|
LSH #100 |
| Earth: Unwanted Superbaby
|
Adventure #299 |
| Earth: Unwritten
|
Unwritten #1 |
| Earth: Urban Gothic
|
Aftermath #1 |
| Earth: Urban Monsters
|
Urban Monsters #1 |
| Earth: Urban Myths
|
Urban Myths #1 |
| Earth: Usagi Yojimbo
|
Usagi Yojimbo #1 |
| Earth: Utopia created by Wyld Stallyns
|
Bill and Ted's Excellent Adventure |
| Earth: Utopia without a need for heroes (51)
|
Countdown #19 |
| Earth: Utopian Justice Formation
|
Justice League #20 |