But if we're only gone a few minutes-- Then we will ensure the Earth has a Four to stand for it. A minute, a second, a lifetime-- we do not leave the Earth unprotected. 
This issue collects following issues:
"Unstable"
"First Boots on the Ground"
"The Big Bang!"
"The Mobsters are Due on Yancy Street!"
"Voyagers"
"My Funny Valentine"
"I Killed Julius Caesar!"
"The Big Crunch!"