Many of the islanders took the alien invasion as a reason to throw a party but Slone wants none of it, and wants to fight back against the invading force.
Doctor Slone Payphone Locations
Quite a few questlines in Season 7, and beyond, have started with the simple answering of a ringing phone.
The same applies here and you'll need to get yourself to one of the multiple payphones on the map to speak to Doctor Slone.
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How To Speak To Doctor Slone
Once you've located and dropped suitably close to one of the payphone locations, now comes the easy part. Pick up the phone!
As you approach, the phone should already be ringing, interact with it and just like that, the quest is complete and you have 'earned' 15,000 XP.
Lets face it, that's practically free XP, but we're cool with that as long as we get our big payoff when the Season 7 story comes to a head.