Jack will have to make a decision, kill (or put a cork in) the MIB, <a href="http://wdaikff.com">beocme</a> the new protector of The Island (protecting it for what purpose, hopefully we will find out), let the sideways timeline collapse and go e2€œpoofe2€9d out of existence, or continue, with all his e2€œfriendse2€9d still alive and well in an alternate reality. The biggest decision he will have to make is loosing his relationship with his son in the sideways timeline.