Who held the Anti-Monitor captive in the first place in "Crisis on Infinite Earths"?

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I'm basically watching The Flash. I don't watch all the Arrowverse shows.

I was watching The Flash S06E09 - "Crisis on Infinite Earths: Part Three". Then, I came to know that it's a five-episode crossover. So, I watched Arrow S08E08 and Legends of Tomorrow S05E01. In there, I got confused about the role of Pariah - Nash Wells. Later, in The Flash S06E10, I understood that Pariah is the one who actually released the Anti-Monitor. He opened the door for the Anti-Monitor by mistake. That's why everyone is holding him responsible, although he was just trying to find the secret of Novu - the Monitor.

Now, I'm a bit confused. Who held "the Anti-Monitor" captive in Earth-1 in the first place? Is it the Monitor? Which episode(s) do I have to watch to get a clear understanding of the Anti-Monitor's history?

And, another thing is - why didn't Novu/the Monitor (a good guy) tell everyone about the Anti-Monitor's location? He wanted to save the multiverse, I guess. Telling the heroes about Anti-Monitor's location should be the first step, to begin with. Then, the heroes could have stopped Wells to dig up that tunnel wall.






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Who killed the Anti-Monitor in Crisis on Infinite Earths?

of Earth-Three; Darkseid; Superboy of Earth Prime; and Kal-L, the Superman of Earth-Two) were able to weaken the Anti-Monitor enough for Kal-L to deliver the final blow, destroying the Anti-Monitor by punching him into a star.

Who imprisoned the Anti-Monitor?

Through her state of death, she made contact with the demon Nekron, who is the one responsible for imprisoning the Anti-Monitor in the black battery as its power source.

Who is the Anti-Monitor Arrowverse?

The obstacles that Oliver faces in Arrow season 8, episode 7 were apparently creations of the "Crisis on Infinite Earths" villain, Anti-Monitor. The Anti-Monitor (LaMonica Garrett) just made his first move against Oliver Queen (Stephen Amell) on Arrow.



The Anti-Monitor destroys the last remaining Earth | The Flash 6x09 | Crisis on Infinite Earths 3




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Images: Anna Tarazevich, Anna Tarazevich, RODNAE Productions, Skylar Kang