Despite centuries of tradition, Doppelgangster steadfastly refuses to use bears, trained or otherwise. Particularly not polar bears. Or koala bears, which in truth are not even bears.
Doppelgangster's work will not go up in value when its members die. In fact, a plague of moths will black out the sun, the plants will turn to dust and tickets are limited.
Doppelgangster may or may not include a known terrorist threat, a pilgrim lost at sea or a regular working class, mortgaged, hard-working, working family. That said, Doppelgangster may be nobody at all.
Original, unquestionably effective... Gripping and intelligent.