Main Characters Admiral Harriman Nelson 110 main appearances Captain Lee Crane 110 main appearances Chip Morton 62 main appearances Kowalski 56 main appearances Chief Francis Ethelbert Sharkey 46 main appearances Patterson 31 main appearances Sparks 21 main appearances Chief Curley Jones 8 main appearances Seaview Doctor 10 main appearances Seaman Stu Riley 6 main appearances Johnson Lola Hale 1 main appearances
Recurring Guest Characters Gregory Malinoff 1 guest appearances General Tau 1 guest appearances Doctor Shinera 1 guest appearances Captain Williams 1 guest appearances Helmsman 1 guest appearances Sonar Man 1 guest appearances Frank Richardson 1 guest appearances Andrews 1 guest appearances Angus 1 guest appearances Lester 1 guest appearances Magistrate 1 guest appearances Crofter 1 guest appearances Allister MacDougall 1 guest appearances Hoff 1 guest appearances Archer 1 guest appearances Tracy 1 guest appearances Admiral Bentley Falk 1 guest appearances Fenton 1 guest appearances The Sister 1 guest appearances Hamid 1 guest appearances ⇤ « 4 5 6 7 8 9 10 11 12 13 » ⇥