Arrow: 10 Things We Learned From The Season 4 Premiere
3. Back To Lian Yu
While it first looked like the flashbacks would take place in Coast City, with Oliver experiencing the growing pains that would lead to him as the Hood we knew from Season 1, it's clear that won't immediately be the case.
After being drugged by Amanda Waller, Oliver wakes off and is promptly kicked off a plane, finding himself falling towards Lian Yu, tasked with infiltrating the unknown enemy and assessing the threat. Upon landing, still full of questions, Oliver is immediately held at gunpoint by some new group using the island as a base.
Nothing much actually happened during the flashbacks and there weren't very many, possibly because there was so much else going on, but it's undeniable how important it is that they're headed back to the island. This is especially true since the producers have stated that not only will he find a new love interest there, but also that this is where he will first experience the magical and mystical that will shape his present day knowledge.