FF8/SGA crossover
I totally swear this was not my fault.
The story that wasn't written:
Defeating the sorceress (Ultimecia) led to breaking their planet out of a time-loop (not that Final Fantasy VIII implied that there was such a thing), which allowed access to the Stargate, whereupon our intrepid heroes discovered the rest of the galaxy, Wraith included ("I thought we were done saving the planet," - Zell; "Well, now we have to save the galaxy," - Rinoa; "Nice to see you're moving up in the world," - Seifer; "Whatever," - Squall).
Eventually, Squall and company encounter the Atlantis contingent, and after some dramatic pieces of heroism, are invited to visit Atlantis itself, which brings us to:
"I can't believe you're allowing this!" Rodney hissed. "These are teenagers we're talking about! That last batch of so-called scientists was in their forties and they're still on the verge of causing imminent death and destruction!"
"Friendly?" one of the three muttered. "Squall, friendly?"
" -- generous, well-meaning, and not to mention extremely powerful new allies," Sheppard finished. "The least we can do is offer a tour of the home they helped save."
"You can't possibly believe that Atlantis will still be standing in another twenty-four hours," Rodney complained.
"None of them have the gene, McKay; what could go wrong?"
"First of all, you'd think that by now you'd have learned to never utter those words in my presence, and second, you don't consider the ability to create a meteorite out of thin air -- "
"Technically, it's made out of ether," another of the boys pointed out. This one had shorter hair than the first.
" -- with the intention of dropping it on someone's head to be the least bit dangerous?"
"I'm sure that if you could refrain from insulting them, they'd be gracious enough to not bother flattening our nice little city."
The short, spiky-haired kid said, "Uh, you guys aren't actually worried about that, are you? Because, like, we're seriously not the bad guys here."