Oliver?
Spoiler alert if you haven't seen the Halloween episode "Danger Things"
[spoiler]In the special Halloween episode "Danger Things", Oliver is one one of the trick or treating kids taken into another dimension by a creepy looking creature. And in the end, all of the kids return to our dimension before the portal closes except for Oliver.[/spoiler]
So is "Danger Things" canon? This that Oliver's fate? Or doesn't it count as canon?