Ra’s al Ghul makes his Arrow debut here, Arrow’s fiftieth episode. There is the niggling question of why a top-tier Batman villain appears on Arrow first, and not Gotham. This ignores the nature of the DC multiverse – he can exist both in Arrow and in Gotham, and not be the same character. I’ll start to worry once he appears in Teen Titans Go!…wait, that sort of happened.

Also, I wonder how much longer Arrow will let viewers know the dead Sara Lance is still dead, thanks to her getting killed and stuff.