Question: Which role is the star of a 2016 film about a surfer surviving a great white shark attack best known for?

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Shark Attack 3: Shark Attack 3: Megalodon is the second sequel to "Shark Attack", released in 2002 straight to video.  The film is notable for featuring John Barrowman, who later found fame in popular shows such as "Doctor Who" and "Torchwood".  Barrowman has said in an interview on "Friday Night with Jonathan Ross" that he only did the film for the money, and was rather embarrassed when a clip from the film was shown.  Actress Jenny McShane from the first "Shark Attack" film has a starring role, albeit as a completely different character.

Stephan Swanson: Stephan Swanson came to prominence as a marine researcher when he successfully placed the satellite transmitter on the famous Great white shark Nicole, the first great white shark ever to be tracked on a 20,000 kilometer migration from South Africa to Australia and back.  Due to his ability to handle large marine predators, such as the great white shark, he was contracted as an expedition biologist to travel to Guadeloupe and place satellite transmitters on the dorsal fins of Great Whites.  His historical capture and release of a 5m long, 1800 kilogram great white shark is documented in the National Geographic Marine Special "Ultimate Shark".

Blake Lively: Blake Lively (born Blake Ellender Brown; August 25, 1987) is an American actress.  She is best known for her role as Serena van der Woodsen in the CW drama series "Gossip Girl" (2007–12).  Lively has also starred in such films as "The Sisterhood of the Traveling Pants" (2005), "Accepted" (2006), "The Private Lives of Pippa Lee" (2009), "The Town" (2010), "Green Lantern" (2011), "Savages" (2012), "The Age of Adaline" (2015), and "The Shallows" (2016).

The Shallows (film): The Shallows is a 2016 American survival thriller film directed by Jaume Collet-Serra, written by Anthony Jaswinski and starring Blake Lively.  In the film, a surfer gets stranded 200 yard from shore, and must use her wits and determination to survive a great white shark attack.  Principal photography began in October 2015 in New South Wales and Queensland, Australia.

Zombie Shark: Zombie Shark is a docufiction program by Discovery Channel for the 2014 Shark Week.  The premise of the program is that sharks can be brought into a state of tonic immobility (a kind of trance) by flipping them on their back, and that this characteristic might explain how a supposed series of Great white shark killings occurred: the suggestion is that Orcas have developed that skill and are thus able to kill large numbers of sharks.  "Zombie Shark", indeed much of Discovery's 2014 programming, was panned by critics, with the "Houston Press" claiming that Discovery had jumped the shark.

Shark attack: A shark attack is an attack on a human by a shark.  Every year over 70 attacks are reported worldwide.  Despite their relative rarity, many people fear shark attacks after occasional serial attacks, such as the Jersey Shore shark attacks of 1916, and horror fiction and films such as the "Jaws" series.  Out of more than 489 shark species, only three are responsible for a double-digit number of fatal, unprovoked attacks on humans: the great white, tiger, and bull.  The oceanic whitetip has probably killed many more castaways, but these are not recorded in the statistics.

Sand tiger shark: The sand tiger shark ("Carcharias taurus"), grey nurse shark, spotted ragged-tooth shark, or blue-nurse sand tiger is a species of shark that inhabits subtropical and temperate waters worldwide.  It inhabits the continental shelf, from sandy shorelines (hence the name sand tiger shark) and submerged reefs to a depth of around 191 m .  They dwell in the waters of Japan, Australia, South Africa, the Mediterranean and the east coasts of North and South America.  Despite its name, it is not related to the tiger shark "Galeocerdo cuvier"; however, it is a cousin of the great white shark "Carcharodon carcharias".  Despite its fearsome appearance and strong swimming ability, it is a relatively placid and slow-moving shark with no confirmed human fatalities.  This species has a sharp, pointy head, and a bulky body.  The sand tiger's length can reach 3.2 m .  They are grey with reddish-brown spots on their backs.  Shivers (groups) have been observed to hunt large schools of fish.  Their diet consists of bony fish, crustaceans, squid, skates and other sharks.  Unlike other sharks, the sand tiger can gulp air from the surface, allowing it to be suspended in the water column with minimal effort.  During pregnancy, the most developed embryo will feed on its siblings, a reproductive strategy known as intrauterine cannibalism i.e. "embryophagy" or, more colorfully, adelphophagy — literally "eating one's brother".  The sand tiger is categorized as vulnerable on the International Union for Conservation of Nature Red List.  It is the most widely kept large shark in public aquariums owing to its tolerance for captivity.

Cosmopolitodus hastalis: Cosmopolitodus hastalis or Carcharodon hastalis, the broad-tooth mako or broad-tooth white shark, is an extinct white shark that lived from the Eocene epoch to the Pleistocene epoch.  Its teeth can reach lengths up to 3.5 in (7.5 cm) and are found worldwide, especially in Miocene and Pliocene marine deposits.  It is believed to be an ancestor to the great white shark, a fact supported by the transitional species "Carcharodon hubbelli", and most likely would have been one of the top predators in its ecosystem; preying upon small whales and other mammals.

Great white shark: The great white shark ("Carcharodon carcharias"), also known as the great white, white pointer, white shark, or white death, is a species of large mackerel shark which can be found in the coastal surface waters of all the major oceans.  The great white shark is notable for its size, with larger female individuals growing to 6.1 m in length and 1950 kg in weight at maturity.  However most are smaller, males measuring 11 to and females 15 to on average.  According to a 2014 study the lifespan of great white sharks is estimated to be as long as 70 years or more, well above previous estimates, making it one of the longest lived cartilaginous fish currently known.  According to the same study, male great white sharks take 26 years to reach sexual maturity, while the females take 33 years to be ready to produce offspring.  Great white sharks can swim at speeds of over 56 km/h , and can swim to depths of 1200 m .

Scott Gurney: Scott Gurney (born 1972) is an American executive producer, writer, director, actor, model, and entrepreneur who has created several television series documentaries and unscripted/reality TV programming including the highly rated "Duck Dynasty", "Auction Hunters", "Haunted Collector", "Speed of Life", and "American Guns".  Gurney is also well known for producing several "Shark Week" specials for Discovery Channel including "Killer Sharks: The Attacks of Black December", "How Sharks Hunt", "Shark City", "Shark Attack Survival Guide", and "Great White Appetite".

Supporting paragraphs: Blake Lively The Shallows (film)
Answer: Serena van der Woodsen