Arrow Season 4 Spoilers: Everything You Need To Know
5. Diggle Puts On A Mask
Diggle may have stopped trusting Oliver at the end of last season, which is likely to happen when a person kidnaps you wife and leaves your baby daughter alone, but he has still taken his advice of covering up his face when out on the streets fighting bad-guys.
With headwear inspired by Magneto, Diggle will be leading the team in Oliver's absence, and things aren't going to be too rosy between the two when he returns. This is addressed by Diggle in the trailer, saying: "Even when we're both out there, we're not out there together." This division leads to the pair of them almost getting killed.
The brother-like bond between them has been well and truly broken, but they're still being forced to work together this year. If that's going to succeed, then at some point the damage is going to have to be repaired.