Scientific Problem: Aliens

Look, we're having a peculiar issue here: I was told that an alien has infiltrated the ranks of the cosmonauts!
It might be a hoax, of course, or some kind of games between secret services. I remember how we pulled a scam with fake aliens in the Dead Sea. Most likely this is in fact a League's agent. Or maybe an infiltrator from some kind of cult. But better err on the side of caution...
I want you to question all the cosmonauts and learn whether all of them are really from our world. Be careful: what if aliens can use their "psionic abilities" to manipulate your mind? Don't allow him to fool you!

Has the experiment been conducted successfully?

Have you exposed the alien? Excellent! Now we can study his methods of disguising himself and learn how exactly was he able to fool our entire space program. This is important for the Wireframe project's security.