A is for...

AGEING
Immortals age normally until their first 'death', then stop abruptly. One (Kenny) has been stuck at the age of ten for 800 years, allowed to look but sadly never old enough to touch - or stay up late (C7, 'The Lamb'; D6, 'Reunion').

AHRIMAN
An ancient demon who Duncan is fated to meet from the moment he's born (E18, 'Archangel'). Unfortunately for the Highlander, defeating Ahriman - who appears as enemies from Mac's past, allowing for the likes of Horton and Kronos to make reappearances despite the fact that they're dead - will only come at a cost (F1, 'Avatar'; F2, 'Armageddon').

AMANDA
Amanda is at once both lover and tormentor of Duncan. Born in the 9th Century and tutored by Rebecca Horne (B19, 'Legacy'), Amanda is a frequent visitor to Duncan's dojo or barge, but rarely stays long. She's also so popular with other Immortals they go out of their way to track her down (see O and Z). She was also so popular with TV execs they gave her her own short-lived series, Highlander: The Raven.

B is for...

Lucy BECKER
Amanda's constant companion in Toronto, fully aware of her past, and happy to act as confidante, housekeeper, financial planner and general dogsbody. We discover Lucy's back-story, including her marriage to an Immortal, in R10, 'Passion Play'.

BUZZ
All Immortals give off a 'buzz' that betrays their presence to other Immortals close by. This not only makes it impossible for them to sneak up on each other, but probably causes some serious headaches when a large group convene. No wonder they're testy around each other...

Lord BYRON
Yes, the Lord Byron is an Immortal, and friend of Methos. In 1997 he's a rock singer, but his obsession with fame leads to a final confrontation with Duncan. As he himself once said, "All tragedies are finished by a death." His, in this case. (E17, The Modern Prometheus)