The Marvel movie universe is vast, as anyone who’s sat through both Avengers movies knows. But as big as it is, there are also a large amount of obscure characters that only the most knowledgeable comic-book fan would recognize.

We had a chance to sit down with many of the stars of Captain America: Civil War (opening in theaters today) and put their comic-book knowledge to the test: Were the names we were giving them real oddities in the Marvel catalogue? Or did we just make them up? Watch the video above.

Asbestos Lady, for instance, sounds fake. But as Anthony Mackie (Falcon) and Jeremy Renner (Hawkeye) both knew, she is actually a real character.

Other real superheroes, such as Turner D. Century and Paste-Pot Pete, definitely threw Mackie, Renner and Elizabeth Olsen (Scarlet Witch) for a loop. But navigating through the world of obscure Marvel characters was made even more difficult thanks to the fake names we tossed in such as Major Lazer, Mr. Plow and Kazoo Kid.

Watch Anthony Mackie explain why Falcon’s costume is better than Iron Man’s:

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