"Six Degrees: Next of Kin"
Dinah Lance comes to visit Roy and Lian Harper when they are attacked by Vandal Savage's minions. As it turns out, Roy and Lian are descendants of Savage, and he wants Lian to provide replacement tissue for his injured body. Roy leaves Lian in Dinah's care, and takes off to find and stop Savage. In a flashback to the events of Green Lantern (Vol 2) #86, they remember when Green Lantern brought Roy to Dinah's apartment one night, and she had to help him overcome his heroin withdrawal, an event that forged a lasting bond between them.