The original (unaired) pilot episode was shot with a different cast. Elizabeth Lackey was the first to assume the role of Lt. Jamie Avery, Azura Skye played Karen Kawalksi and rock musician Meat Loaf, was barman Digger. The only "survivors" from that shoot were Dominic Purcell, and, John Marshall Jones.
After the shows original run on the Fox network it was syndicated to the Sci-Fi Channel in 2006.
Jayne Brook and John Marshall Jones have both appeared on NCIS on different episodes.