Board Thread:Spoilers!/@comment-27060727-20160824022100/@comment-6175354-20160826193125

JennaMae wrote:

However, Captain Nemo most likely will be the main guest star of focus for 6x06 and the casting announcement indicates that he will have his backstory explored. That /should/ make this captain different but we'll see. And like someone mentioned above, Hook might not even be in the flashbacks. Nemo probably comes from a new land (that Hook may or may not have ever visited).

Adam and Eddy implied, that Nemo and Hook have history.