text: SHADOWHUNTERS - "All Good Things." - In the second part of the series finale, Jonathan begins his reign of vengeful terror as the Shadowhunters try to find a way to stop him. With only one hope, Clary must make a sacrifice that could have long lasting implications for all. Meanwhile, wedding bells are in the air for one special couple. This episode of "Shadowhunters" airs May 6 (8:00-10:30 p.m. EDT) on Freeform. (Freeform/Ben Mark Holzberg) KATHERINE MCNAMARA