Arrow (2012)

S3E22 This is Your Sword

Ra's informs Nyssa that she has no choice but to marry Oliver, or she will be killed. At the same time, an unforeseen ally arrives in Starling City, seeking assistance from Diggle, Felicity, and Laurel to breach Nanda Parbat. Meanwhile, in flashbacks, Maseo and Oliver scramble to discover a cure for Akio before time runs out.