oliver queens friend dies, finds out hes the green arrow.
also the black arrow guy is john barrowman, forgot the guys name in the show. He's also the father of oliver's sister.
Lastly, the guy distributing the steroid and rage serum is deathstroke. hes pissed cause oliver was forced to chose between some chick with a weird mouth that bugs me whenever she talks and some random asian chick he just met on the island, he chose the one with weird mouth so the guy killed the asian chick. at the time, slade wilson was in love with her (asian chick).
He was also near death due to some bomb going off and fire so he had to take the mirakuru otherwise he'd die

"Get out normies reeeeeee"