SolarmovieOne

Watch Justice League: Crisis on Infinite Earths - Part One online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

The Anti-Monitor (the Monitor’s evil counterpart) is released in the DC Multiverse and begins to destroy the different Earths that compose it. The Monitor attempts to recruit heroes from across the Multiverse, but is murdered.