Chris George had a legendary stunt double, Hal Needham, who was credited as stunt coordinator for the show, but doubled for George himself in this and many other projects. They had a very similar look, body type, etc. Reportedly George did also do some action scenes himself that he didn't have...
Ordered from Amazon this afternoon, looks like it was just added today:
https://www.amazon.com/Immortal-Complete-Collection-Christopher-George/dp/B0773TC9PN/
They expect to have it in stock by the 13th.