“Allegiance”
“Allegiance” Picard is abducted by unknown aliens and finds himself in what seems to be a cage of lab rats - together with three other persons from different planets. After some unsuccessful attempts to escape he finds out that the Bolian woman Mitena Haro, one of his fellow prisoners, is not what she appears to be. In the meantime a false Picard is commanding the Enterprise, but his silly behavior helps to unmask him. When Picard is eventually rescued, he gives the three aliens who are responsible for the kidnapping a taste of being imprisoned by confining them in a forcefield. summary by Ex-Astris-Scientia
Uhm… what can I say? Another classical one. Yes, I know the characters are almost caricatural but I guess that was the whole point. I even wrote an episode of my own Star Trek Andromeda fanfic, based on a similar idea. At least I was trying 