You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "what season is crisis on earth x part 1?" whose answer is fourth.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did crisis on earth-x part 1 air
Useful Output:

Doc 1: "Crisis On Earth-X" kicks off Monday, Nov. 27, at 8 p.m. ET/PT, with the heroes brought together by the wedding of Barry Allen (Grant Gustin)
Doc 2: It began with a wedding, and sadly, it ends with a funeral. Here's all the big ways that the Arrowverse has changed in the aftermath of “Crisis on Earth-X.”
Doc 3: The 4-Part Crossover Event begins Monday, November 27 with Supergirl, “Crisis on Earth X, Part 1” (8:00-9:00pm ET). Arrow, “Crisis on Earth X,
Doc 4: Kayti Burt recaps the first night of the "Crisis on Earth-X" crossover on Supergirl and Arrow, which included Barry and Iris' wedding,
Doc 5: The CW's special 'Crisis On Earth-X' Arrowverse event will air on Monday, November 27 and Tuesday, November 28. TV News · The Flash · Supergirl.