Supergirl, Season 3

[An unfamiliar person walks into the D.E.O. lab.]

Alex:
[drawing her gun] Hey! Stop right there.

Mon-El:
Whoa. Whoa, whoa, whoa. Guys, it's Brainy.

Brainy:
Oh, of course. I'm wearing a personal image inducer. [touches his forehead, regains his alien appearance] I had to purchase some apple cider vinegar and I nearly caused a riot at the Piggly Wiggly.

Kara:
Huh.

Brainy:
[resuming his illusory disguise] I thought this would, uh... help me fit in better.

Winn:
[walking in] Hey, guys. I just got word from City H-- [sees the disguised Brainy] .... Hi, Brainy

Kara:
Wait, you-you recognize him?

Winn:
Yeah. What, is that an image inducer? Eh? Ah, so our brains just think we're seeing a human, but nooo. Hey, can I borrow that for Halloween?