Robert Wagner guest stars on the 150th episode of NCIS as Tony's father. The family is seen here.

NCIS Season 7 Episode 12 Quotes

Abby: Maybe Tony didn't have a mother. Maybe he was cloned!
Ducky: There certainly is a strong familial resemblance.

Tony: I've heard the saying "he got blown out of his shoes", but I never thought I'd see it.
Ducky: Now if the explosion had knocked his socks off, that would be impressive, wouldn't it?