Warning: SPOILERS for Crisis On Infinite Earths Part 1.

Here's who died in Arrowverse's Crisis On Infinite Earths: Part 1. The Arrowverse's biggest crossover ever takes place over all five superhero series on The CW, starting with Supergirl. Crisis has been building since last year's Elseworlds crossover, which introduced the cosmic being known as The Monitor (LaMonica Garrett), who began 'testing' the many worlds of the Multiverse to see if they were strong enough to survive the cataclysm to come. Crisis has accelerated throughout the current seasons of Supergirl, The Flash, Batwoman, and Arrow but now the end is here.

With the anti-matter wave sent by Crisis' big bad, the Anti-Monitor, threatening the Multiverse, Harbinger (Audrey Anderson) gathered Green Arrow (Stephen Amell), Mia Smoak (Katherine McNamara), Superman (Tyler Hoechlin), Lois Lane (Elizabeth Tulloch), Sara Lance (Caity Lotz), Ray Palmer (Brandon Routh), Batwoman (Ruby Rose), and The Flash (Grant Gustin) to Earth-38, the home of Supergirl (Melissa Benoist). The heroes had to defend Kara Zor-El's world from the anti-matter wave using a Quantum Tower constructed by the Monitor and repel an attack by a horde of Shadow Demons. However, despite their best efforts to evacuate the planet with the help of Lena Luthor (Katie McGrath), they couldn't save Supergirl's world.

Related: Supergirl Reveals Lex Luthor As The Hero Who Saves The Multiverse In Crisis

Crisis Part 1 delivered on the promise that the crossover's stakes are life and death on a Multiversal scale. Literally billions died in the first chapter of the epic and this, shockingly, included one of the Arrowverse's founders and greatest heroes. Here's the body count of Crisis Part 1, which is just the start of the cataclysm that will reshape the Arrowverse:

Melissa Benoist as Supergirl, Chyler Leigh as Alex Danvers, David Harewood as Martian Manhunter Argo Destruction Crisis on Infinite Earths
  • The Earths destroyed by the antimatter wave at the beginning of Crisis included Earth-89, home of Michael Keaton's Batman and Alexander Knox (Robert Wuhl), Earth-9, home of DC Universe's Titans, Earth-66, home of Batman '66 and Dick Grayson (Burt Ward), and the Nazi-controlled Earth-X, home of The Ray (Russell Tovey).
  • Alura (Erica Durance), the mother of Supergirl. Alura was introduced in Supergirl season 1, when she was played by Laura Benanti but Smallville's Erica Durance took over the role in season 3. Alura helped Superman and Lois launch their infant son Jonathan on a rocket before the antimatter wave struck, in a moment poignantly echoing Kal-El's origin story, so Jon Kent survived, though he landed in Earth-16's Star City in the year 2046 and had to be saved by Lois, Brainiac (Jesse Rath), and Sara Lance. Of course, Durance will return as Smallville's version of Lois Lane later in Crisis.
  • Everyone on Argo City, the last surviving city of Krypton. Unfortunately, Argo had no starships to evacuate besides the spacecraft Alura saved for baby Jon so the people of Argo were all wiped out by the antimatter wave. Luckily, Harbinger teleported Superman and Lois to Earth-38 at the last minute.
  • Earth-38 was destroyed, including 4 1/2-billion people who couldn't evacuate the planet in time. Despite the superheroes' efforts to defend the planet, they couldn't stop the antimatter wave from wiping out Supergirl's adopted world. While a wave of spaceships supplied by Brainiac and many of the aliens who took refuge on the planet was able to evacuate 4-billion lives to Earth-1 (thanks to a dimensional portal built by Lena Luthor), they couldn't save everyone. The Monitor said 7.53-billion people lived on Earth-38 so only 3-billion survived when the planet was destroyed.
  • Green Arrow (Oliver Queen) gave up his life to help the evacuation of Earth-38 after the Monitor had teleported the rest of the superheroes to Earth-1. Out of arrows, Green Arrow took on the army of Shadow Demons by himself and was fatally injured before the Monitor rescued him. Oliver had long expected to die during Crisis and he spent all of Arrow season 8 preparing for the inevitable. On his deathbed, Oliver confessed to Barry Allen and Kara Danvers that he made a deal with the Monitor to spare their lives in exchange for his during Crisis - but the Monitor revealed that this wasn't the death he foresaw for Oliver, which casts serious doubt on how the Arrowverse's heroes can defend the Multiverse in Crisis On Infinite Earths.

Next: Predicting Who Else Dies On Crisis On Infinite Earths

Crisis On Infinite Earths Part 2 continues on Batwoman Monday @ 8pm on The CW.