Michael Weatherly returning to NCIS for season 24
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CBS' NCIS is officially the last TV franchise of its kind
NCIS has a reputation and legacy that's impossible to replicate, 23 years after the flagship aired on CBS with Mark Harmon as Leroy Jethro Gibbs.
The long-time franchise lead also narrates the prequel series and is an executive producer.
NCIS: Los Angeles' alum Eric Christian Olsen is returning to the 'NCIS' franchise, joins 'Origins' as executive producer.
The ongoing CBS procedural has had some major names briefly join the cast during its decades on the air. Here are just a handful of standouts.
