Yeah, the Fables crossover. It took place over the annuals between the three of them in '88, though the Question one is the only one I have currently. (i think there are scans from the Green Arrow annual where Dinah and Shiva spar in one of scottyquick's Grell-era megaposts)
I checked it against the page in Cry For Blood (which isn't in my post of that, because i'm a dipshit) and the layouts are really similar, right down to a conversation with Richard in the middle, but it's pretty clear Burchett did his own thing with it while still paying homage to Cowan's.
And Helena's supposed to show up in the sixth issue of the run, from what I hear, so #860? All I know is I'm too excited and wish I didn't have to wait, though it'll be just in time for Christmas if my math is right!
and jeez i was wondering if anyone was ever going to respond to this