I co-wrote Unpleasant Memories with Firemagic, and that was good because I knew (and still know) nothing about Sailor Moon.

Similarly to other people, I co-wrote mission with people where I didn't know one of the continua involved. Specifically, the TSAB DOWNFALL mission Firemagic already mentioned and a Warframe x Five Nights at Freddy's co-write with Voyd (why someone thought crossing those two continua over was a good idea, I really don't know).

My first co-write with Voyd involved Five Nights at Freddy's, but aside from Markiplier's LPs of them I don't know the game so well. I also did a Devil May Cry mission once, though that was pretty short.

I'm also planning to do a co-write with firemagic which involves a Magical Girl Lyrical Nanoha X Pokémon fic, the former of which I know diddly squat about, but I have yet to get any response from her about starting it off. I can wait if she’s busy with other things, though.

But I've beta-read missions/fanfics set in continua I don't know very well.

I didn't know the Twilight part; haven't read the books or seen the movies. My agents used a pocket fictionary to get around the problem.

Working on something with Ix to that effect now, and trying to work my personal ignorance of the canon into jokes. Most of them are about Greek mythology. Since it's the Notary, none of them are repeatable.

And yes, she's coming back. =]

I did 'The Parent Trap' in my fifth Driftwood mission. I think I saw that film once. About two decades ago.

(If you're wondering how I did it: my wife used to love that film, and both the key scene I needed to look up, and the entire script, are available online.)

hS

The first one to come to mind is TSAB: Downfall, the Nova mission. I did not and still do not have any knowledge of Halo, hence why it was a cowrite! And I've done Yu-Gi-Oh missions with Des for the same reason.

The mission I just did with Neshomeh, into LotR, might qualify. I mean, I've read the books a few times, and know a bit of random trivia thanks to reading missions, but I simply don't have the depth of knowledge needed to take a mission into the continuum.

That's part of the reason cowrites happen: there's a crossover, but each author of the cowrite only knows one of the fandoms involved.

This is the case with almost all of my cowrites; the exceptions being my second SkarmorySilver cowrite and my first collab with Iximaz.

In case one, it made sense from an in-universe standpoint to have more people because Attack on Titan is dangerous. In case two, I'd simply forgotten the fandom that I'd originally written the fic for.