New Delhi, Nov. 27 -- As "Stranger Things" returns with Season 5, many viewers are suddenly asking the same question: who exactly is Holly Wheeler?

The young Wheeler sibling, who has barely appeared throughout the series, is now at the centre of one of the season's biggest storylines.

Across the first four episodes of Season 5, now streaming on Netflix, the plot places Holly Wheeler - portrayed by Nell Fisher after being previously played by twins Anniston and Tinsley Price - in a surprisingly crucial role.

Holly is the youngest child of Ted (Joe Chrest) and Karen Wheeler (Cara Buono) and the little sister of Mike (Finn Wolfhard) and Nancy (Natalia Dyer). Until now, she has mostly remained in the background while the show followed Mike...