Princess Alexia encounters a "fake" Shadow Garden member while on patrol, forcing her to defend herself against enemy reinforcements. 2. Person of Interest (Season 4, Episode 6)

In the Transformers toy line and lore, the are robots hidden inside "shells" that look like humans or monsters.

Reese (Jim Caviezel) meets an unassuming office worker who is pretending to be a detective . This "pretender" accidentally stumbles into a dangerous conspiracy, leading Reese to protect him.