9 Things to Remember About 'Crisis on Infinite Earths' Before the Final 2 Episodes (PHOTOS)

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Crisis on Infinite Earths: Part Four
Dean Buscher/The CW
Crisis on Infinite Earths: Part Two
Dean Buscher/The CW

Plenty of cameos

Before a wave of anti-matter wiped out the multiverse, the crossover offered glimpses at some Earths we hadn’t seen before. And that was how we got appearances from Smallville‘s Clark (Tom Welling) and Lois (Erica Durance), Brandon Routh as Clark, Kevin Conroy as Bruce Wayne, Tom Ellis as Lucifer, and quite a few others. But it’s unlikely we’ll get any more given the end of the third hour.

Crisis on Earth-X, Part 3
Katie Yu/The CW

Black Lightning joined the fight

Pariah brought Jefferson to Earth-1 as his Earth was destroyed to help them save humanity. And Jefferson’s power came in handy as Team Flash and Earth-90 Barry figured out how to stop the Anti-Monitor’s machine.

COIE paragons
The CW

The identities of the paragons

As the Monitor revealed, across space and time were seven heroes, “beings of the purest will who can ultimately defeat the Anti-Monitor and help save the universe.” These paragons are Barry (Love), Ryan Choi (Humanity), J’onn J’onzz (Honor), Kara (Hope), Routh’s Clark (Truth), Kate (Courage), and Sara (Destiny).

COIE Pariah
The CW

Pariah saved the paragons

The heroes realized too late just how much the Anti-Monitor had been able to take control of, namely, Lyla. As his wave of anti-matter destroyed Earth-1 and came for the Waverider, Pariah was able to send the paragons somewhere the Anti-Monitor couldn’t follow: the Vanishing Point, “a point outside of time and space.”

COIE Lex
The CW

Lex rewrote destiny

But once the paragons were safely at the Vanishing Point, Clark collapsed and was replaced by … Lex! When he’d had the Book of Destiny, he saw the paragons would end up there and “thought destiny could use a little rewrite.”

COIE Anti Monitor Monitor
The CW

The Anti-Monitor defeated the Monitor

After being MIA for quite some time, Lyla returned to the Waverider near the end of Episode 3, only for the others to realize the Anti-Monitor was controlling her. And through her body, the Anti-Monitor declared it time to end the age of heroes. He easily overpowered the Monitor.

COIE Anti matter
The CW

Almost everyone has technically been wiped out of existence

Throughout the crossover thus far, a wave of anti-matter was ripping its way across the multiverse, with Earth-1 the last target. While the heroes momentarily stopped it before it took Earth-1, by the end of Episode 3, every Earth and everyone except for the paragons (and Lex) had been destroyed.

Crisis on Earth-X, Part 3
Katie Yu/The CW

Earth-90 Barry took Earth-1 Barry’s place

The Anti-Monitor used Earth-90 Barry’s speed to build his anti-matter cannon and his test of it destroyed Earth-2. When Team Flash found him running on a treadmill, this Barry revealed the Anti-Monitor designed it so that if he stopped, all remaining Earths would be destroyed. They figured out that by reversing the treadmill’s directional velocity, they could destroy the anti-matter wave and machine, and Earth-1 Barry thought the time had come for the Flash to vanish. He was right — but Earth-90 Barry took his place.

COIE Oliver Spectre
The CW

Oliver died and became something else

In the first hour, Oliver sacrificed himself and saved billions from Earth-38 in the process. While Mia and Sara brought his body back using a Lazarus Pit, they had to enlist Constantine to save his soul. However, when Mia, Diggle, and Constantine traveled to purgatory to do just that, Oliver accepted a different path. Jim Corrigan, the Spectre, told Oliver it was his turn to serve “a higher purpose” to “light the spark” and “save everyone.”

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The epic "Crisis on Infinite Earths" crossover concludes with Arrow and Legends of Tomorrow's episodes on Tuesday, January 14, and if you've forgotten any of the key details from the first three episodes, we have you covered. After all, they aired nearly a month ago.

The Arrowverse had been building up to the event for years — just think about that newspaper headline on The Flash — and it's almost time to see just how much is changed when it's all over.

The Arrowverse Joins Forces in 'Crisis on Infinite Earths' (PHOTOS)See Also

The Arrowverse Joins Forces in 'Crisis on Infinite Earths' (PHOTOS)

The five part event brings together the heroes of 'Arrow,' 'The Flash, 'Supergirl, 'Legends of Tomorrow,' 'Batwoman,' and more.

Click through the gallery above for the details you need to know before "Crisis" returns.

Arrowverse "Crisis on Infinite Earths" Crossover, Tuesday, January 14, 8/7c, The CW