The 100th episode of Arrow, a modern-day reboot of DC Comics’ Green Arrow superhero starring Stephen Amell, airs on the CW. Neal McDonough (Boomtown), Grant Gustin (The Flash), Susanna Thompson (Star Trek: Voyager), Caity Lotz (Mad Men, Legends Of Tomorrow), and Brandon Routh (Superman Returns) guest star in an episode which is part of a crossover event involving all of the CW’s DC superhero series.
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The CW airs the 23rd episode of Legends Of Tomorrow, starring Arthur Darvill, Brandon Routh, Caity Lotz and Victor Garber. Stephen Amell (Arrow), Grant Gustin (The Flash), Melissa Benoist (Supergirl), and Donnelly Rhodes (Battlestar Galactica) guest star in the Legends’ chapter of a major DC crossover event.
Cable channel Disney XD airs the 
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The CW airs the 55th episode of The Flash, a modern-day reboot of DC Comics’ superhero starring Grant Gustin. Mark Hamill (Star Wars) guest stars.
The last living member of the original Mercury astronaut group, former Senator John Glenn, dies at the age of 95. Born in 1921, Glenn was a decorated combat pilot who flew during World War II and the Korean War, before turning his piloting skills to testing experimental aircraft. This brought him to NASA’s attention, and he made 
Cable channel Disney XD airs the 
Soundtrack specialty label Varese Sarabande releases a 2-CD set featuring Michael Giacchino’s complete score from 
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Disney and Lucasfilm release 
The 
British-born shuttle astronaut Piers Sellers dies of pancreatic cancer at the age of 61. A veteran of over 559 hours in space as a crew member of shuttle missions 
33-inch-tall actor Mihaly “Michu” Meszaros, who donned the furry suit of the title character in the late ’80s sci-fi spoof Alf, dies at the age of 76. In any instances where the character was shown from head to toe, Meszaros wore a full-body suit, though in many cases the character was a puppet shown only from the chest up, operated and voiced by show (and character) creator Paul Fusco. To maintain the illusion, Meszaros was credited as a “personal assitant” to Alf for his appearances. A circus performer since the early 1970s, Meszaros also appeared in Big Top Pee-Wee, Waxwork, Warlock: The Armageddon, and the TV series Dear John.
Pioneering astronomer Vera Rubin, whose research led to the discovery of dark matter, dies at the age of 88. In the 1960s and ’70s, Rubin found that the rate of galaxies’ rotation could not be accounted for unless galaxies contained, on average, ten times more mass than could be distributed among the visible stars in that galaxy. This research led her to propose the theory of dark matter in the 1970s, though she tried for many years to find – or at least rule out – any other possible explanations to the galaxy rotation problem.
Actress and author Carrie Fisher, universally known as Princess Leia from the original Star Wars trilogy, dies four days after suffering from a massive heart attack on a flight from London to Los Angeles. Alongside a storied career that included movies such as The Blues Brothers, When Harry Met Sally, and a revival of Leia in 2015’s The Force Awakens, Fisher embarked on a writing career that included the semi-autobiographical novel Postcards From The Edge (later adapted into a movie in its own right), which fictionalized elements of her Hollywood upbringing, and autobiographies that exposed her lifelong battles with mental illness. She died at the age of 60.
Milan Records releases the 
Cable channel Disney XD airs the 
Cable channel Disney XD airs the 
Cable channel Disney XD airs the 
Apollo 17 Commander Eugene Cernan, the last human to leave the surface of the moon in the 20th century, dies at the age of 82. One of the members of NASA’s second astronaut class, recruited in 1963 to take part in the Gemini program, Cernan first flew into space aboard Gemini 9 in 1966, a mission in which he became the second American spacewalker, though his assigned tasks outside the Gemini spacecraft proved to be dangerously exhausting. His second flight, as the lunar module pilot for Apollo 10, saw him flying a lunar lander to within miles of the moon’s surface in May 1969, a dress rehearsal for the upcoming Apollo 11 mission. He commanded the final Apollo moon landing mission, Apollo 17, in December 1972, where he earned the title of “last man on the moon” by being the last astronaut to leave the lunar surface to re-enter the Apollo 17 lander. He later wrote an autobiography about his spaceflight experiences, and was frequently outspoken about his disappointment that no one walked on the moon again in his lifetime.
Veteran character actor Miguel Ferrer, a steady presence on TV and the big screen for over 30 years, dies of cancer at the age of 61. Fondly remembered for his villain role in the original Robocop, a recurring role on Twin Peaks, and a brief cameo as the first officer of the hapless U.S.S. Excelsior in Star Trek III: The Search For Spock, Ferrer was co-starring in the popular series NCIS: Los Angeles at the time of his death.
La-La Land Records releases a much-anticipated 
Cable channel Disney XD airs the 
Masaya Nakamura, the founder of pioneering Japanese video game maker