" is the two-part second-season finale
of the Fox
science fiction drama series Fringe
. Both parts were written by Academy Award
-winning screenwriter Akiva Goldsman
, together with showrunners Jeff Pinkner
and J. H. Wyman
. Goldsman also served as director. Fringe'
s premise is based on the idea of two parallel universes
, our own and the Other Side
, which began to clash in 1985, after Dr. Walter Bishop
) stole the parallel universe version of his son, Peter
, following his own son's death. The finale's narrative recounts what happens when Peter (Joshua Jackson
) is taken back to the Other Side by his real father, dubbed "Walternate"
agent Olivia Dunham
) and Walter lead a team of former Cortexiphan
test subjects to retrieve him, after discovering that Peter is an unwitting part of Walternate's plans to bring about the destruction of our universe using an ancient doomsday device
. Part one aired on May 13, 2010
, to an estimated 5.99 million viewers, while part two broadcast a week later to 5.68 million. Both episodes received overwhelmingly positive reviews, with critics lauding the subtle differences between each universe. The finale was selected for multiple 2010 "best of television" lists.