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: "when does season 4 of agents of shield start?" whose answer is September 20, 2016.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did season 4 of agents of shield start
Useful Output:

Doc 1: Marvel's Agents of SHIELD returns this week with its fourth season. The last season put the agents through some tough times.
Doc 2: The seventh and final season premiered in May in the United States, leaving UK fans hungry for details about when it might arrive on our shores.
Doc 3: It was announced in July that Agents of SHIELD is ending with Season 7. When all is said and done, the ABC show will have aired 136 episodes across seven years.
Doc 4: Season 4 has three major parts: Ghost Rider, the Life Model Decoys (LMDs), and the Framework. Let's dive into all of them.
Doc 5: Agents of S.H.I.E.L.D. season 4 premieres Tuesday, September 20 @10pm on ABC. Source: IGN · TV News · Agents of S.H.I.E.L.D..