Just binged the JLA/Avengers crossover from 2003/2004. I thought Wally & Clint winning the day was pretty entertaining. I also think it's super cool that the crossovers are technically in canon for both universes (at least before recent reboots, as far as I know). I think it would be very interesting to see a sequel or like a single character crossing universes.

I think at one point there was a rumor of something like this happening (I think it was Static Shock switching publishers for a year?), but nothing ever came of that. Since I was not sure where to put this, there's two versions of the thread. This one is for Wally West being sent to the Marvel Universe at some point after JLA/Avengers.

What point would you put him in? Is there any particular moment where a character might "tap" an outsider for help?

Here's a link for the other thread, dedicated to Clint Barton in the DC Universe.