The Arrow season 2 finale is drawing near and some rumors are popping up about a possible Ra's Al Ghul appearance and Harley Quinn referencing Joker in the Arrow season 2 finale.

The Suicide Squad episode was one of the most well received episodes this season and it keeps up the theme of referencing "Batman Universe" characters in the show with the Harley Quinn tease.

As the Batman Universe teases keep on coming, fans speculate that the earlier referenced Ra's Al Ghul will appear on the Arrow season 2 finale to set him up as the "big bad" of Arrow season 3.

This would make sense as there has been some hints that Slade Wilson will be "redeemed" at the season finale thus making him a good guy at the end.

So the question is will Slade Wilson turn good then die by the hands of Ra's Al Ghul? Let's wait until the Arrow season 2 finale.

Speaking of the finale, Harley Quinn has been rumored to fully appear on the season 2 finale and a Joker reference is expected, whether the reference will be big or small, fans are sure to pick up on it. Though don't expect a Joker appearance on "Arrow".

What do you think will happen on the Arrow season 2 finale? Do you believe Ra's Al Ghul will appear on the finale? Sound off in the comments below!