Premise: "Fight or Flight" is the fifth episode of the second season of the NBC science fiction drama series "Heroes". It aired on October 22, 2007. This episode marks the first appearance of Elle, played by Kristen Bell, credited as a series regular. David Anders (Takezo Kensei) is also credited as a series regular from this episode.
Hypothesis: Kristen Bell appeared in an NBC show aired in the 21st century.