What episode of legends of tomorrow is the crossover?
No context provided
What episode of legends of tomorrow is the "Invasion!" crossover?
23
No context provided
What episode of legends of tomorrow is the "Crisis on Earth-X, Part 4" crossover?
41
No context provided
What episode of legends of tomorrow is the "Crisis on Infinite Earths: Part Five" crossover?
68
Legends of Tomorrow
https://en.wikipedia.org/wiki/Legends%20of%20Tomorrow
List of Legends of Tomorrow episodes
https://en.wikipedia.org/wiki/List%20of%20Legends%20of%20Tomorrow%20episodes
The Invasion crossover in Legends of Tomorrow was in episode 23. The Crisis on Earth-X, Part 4 crossover was in episode 41. And, the Crisis on Infinite Earths: Part Five crossover was in episode 68.