As Nightwing shook down various no-gooders, Angel Marin's body turned up, with it's head on backwards. Oracle gave Nightwing a name - Roland Desmond aka Blockbuster. He called some Titans buddies for info on him, and then tracked him down; Soames was at Blockbuster's side.
Robin (Grayson) appears in a dream/flashback.
John & Mary Grayson appear in flashback.