Big Finish, the guys who make Doctor Who audios, Stargate audios, Sapphire and Steel audios, 2000 AD audios and even audios for the recently cancelled Robin Hood have started making Highlander audios. Yay!
I recently purchased the first one with a view to listening to it on holiday it looks very cool and is explicitly set during Highlander: Endgame and Highlander: The Source, even explicitly referencing significant events in Endgame (no - not that one - they reference the villain!) It's narrated by Adrian Paul, who has a bit of an accent, but with a 2nd voice typically as the villain of the piece.
I've bought the other 2 audios as well and hope to have the last one when it is released. Sadly given the dismal activity on their forums and the other Highlander forums I don't imagine a 2nd season being commissioned - I never thought of Highlander the TV Series as that popular in the UK - which is Big Finish's main market. However if I'm wrong I'll be queueing up to buy more.