Your ideas for a JL/JLU episode!

[Batman's Biggest Fan]

Anyway it contains every member and every member of the JLU including Terry.

When the Flash causes Batman's new alternate dimension device to backfire they end up in the time of the JLU They meet them and both think they are evil versions of themselves so it results in a fight with it being

Batman vs. Batman
Superman vs. Superman
Wonder Woman vs. Barda
Green Lantern vs. Green Lantern
Martian Manhunter vs. Micro
Hawkgirl vs. Warhawk
Flash vs. Aquagirl

meanwhile the Joker has somehow followed the Justice League

[Frank White]

I would like to see a story similar to Days of the Future Past. The JLU gets a vision of the past where they die and in order to preserve their future they must prevent the JL from doing something, which leads to a conflict. I don't know I'm tired of the mandatory, two teams must fight because of a misunderstanding plot ala JL and JG

[Karkull]

Have the two teams take on a time-traveling foe like Per Degaton or the Lord of Time.

[GothamGirl]

Rather than see them fight each other this is what I would like to see

Pt 1.
Villians and Heroes from the past and future trading places.
Joker trades with a few Jokerz(armed with advanced technoligy)
Batman trading with Batman
Mr. Freeze trading places with Blight
Scarecrow trading places with Spellbinder
Clayface trading places with Inque
Mad Hater trading places with Shriek
Braniac trading places with Zeta
Green Lantern trading places with Green Lantern
Live Wire trading places with Willie Watt
Aquaman trading places with Aquagirl
Roxy Rocket trading places with Stalker
Klarion trading places with Bigtime
The Creeper trading places with Curare
Weather Wizard trading places with Mad Stan
Jimmy Olsen trading places with Max
Harley Quinn trading places with Dana
Poison Ivy trading places with Dr. Able Cuvier
Killer Croc trading places with a splicer
Firefly trading places with some future person we have yet to see

[Dark Knight]

I'd like to see just the two teams trade places. The JL in the future and the JLU in the past. Then we could see how it affects them. Bruce would have to confront his cranky old future self. Terry could meet Tim Drake, Barbara Gordon, and Dick Grayson at the height of thier carrers (Not to mention Alfred). Superman comes face to face with Lois (for all we know she could be dead in the future.)
And then of course the action sequences of the old heroes battling the futuristic villains and vice versa. Theres lots of potential for fun there.

[GothamGirl]

Yeah but with MY way, you get to see Hawk girl beet the crap out of Terry.

HawkGirl: Where is Batman?
Terry: I am Batman.
HawkGirl: Where is Batman?
Terry: I am Batman.
HawkGirl: Where is Batman?
Terry: I am Batman.
HawkGirl: Where is Batman?
Terry: I am Batman.
HawkGirl: Where is Batman?
Terry: I am Batman.

[the green flashlight]

If they use a time traveling villian I think it should be Parallax. They could make parallax Kyle Rayner in this universe, that would explain what happened to him. I think it would be cool if John Stewart had to pursue Parallax through time, meeting other GLs along the way including Alan Scott, Hal Jordan, Guy Gardener, and the GL from the JLU. That way you could feature DC characters from many different time frames.

[GL2k2]

Actually, this episode isn't that bad of an idea. It would give the JL team the perfect set up to introduce Chronos. And Bat's Biggest Fan, yes that should be the team's battle, but I'd also like to see it switched up a little.

Superman-vs-Micro
Batman-vs-Warhawk
Wonder Woman-vs-Batman
Hawkgirl-vs-Barda
Flash-vs-Green Lantern
Martian Manhunter-vs-Aquagirl
Green Lantern-vs-Superman