Bernie Kosar's Collar

In Paradise, soon after Number Four's Lumen first develops, there is a scratching at the door and Bernie Kosar in Beagle form is waiting outside. 
Four takes him in and discovers he is wearing a collar with a football shaped tag on it. On one side there is the number 19 and the other has the name 'Bernie Kosar'. The origin of this collar is unknown to this day. 
Category:Loose Ends