Source: dccomics.com
5. The Hitchhiker’s Guide to the Multiverse
(Multiverse: Guidebook #1)
This is the first big tying-together issue. Which is why I like that it comes about something like halfway through the whole series.
This one is half anthology story, bouncing around to some Earths that we wouldn’t otherwise get a chance to see, and half…well, guidebook, laying out all of the Earths. The guidebook half is crazy entertaining, mostly due to all of the artists who contributed beautiful, gorgeous work to illustrating it.
The comic half focuses on a team-up between the post-apocalyptic armored murder Batman of Earth 17 and the childish cartoon character Batman of Earth 42. The two bounce off each other well, and both are interesting characters in their own right, and I would like to see more of Earth 17 Batman and his Marauding Apocalypse-surviving cohorts.
I feel this way not exclusively because his costume makes him look like a weird Batman/Buzz Lightyear hybrid, but also mostly for that reason. That may be the majority of my reasons for wanting to see him more.

