A Matter of Time (1) - S1.E12

A hundred years ago, Amanda was coerced into training with Andre Korda, a ruthless Immortal who raided villages in China. She fled him, but now he's back as a modern-day criminal. The Watchers are on his trail, particularly Joe Dawson (from Highlander). Nick runs into them and is introduced. Korda robs an armored car using his immortality, and Nick insists on bringing him in. Korda escapes when Joe intervenes, since he's taken a vow to keep the Immortals' existence secret. Realizing that Nick won't let it go, Amanda goes to fight Korda's assistant Crysta and takes her head. However, she then disappears and Joe tells Nick that she died. Seeking revenge, Nick travels to Paris and another of Korda's holdings, only to be pre-emptively shot. Before Korda's henchman can finish him, he himself is killed by another shadowy figure who takes Nick away, while Amanda decides to go off to Paris after Nick.