Sea Patrol: Cast Sea Patrol Adventure, Drama, Action – 7/12/11 Australia GeneralEpisodesCastCharactersGallery Cast See full cast → Saskia Burmeister as Lieutenant Nikki "Nav" Caetano Matthew Holmes as Petty Officer Chris "Swain" Blake David Lyons as Leading Seaman Josh "ET" Holliday David Lyons as Leading Seaman Josh "ET" Holliday Lisa McCune as Lieutenant Kate "XO" McGregor Lisa McCune as Lieutenant Kate "XO" McGregor Jay Ryan as Seaman Billy "Spider" Webb Kristian Schmid as Leading Seaman Communicator Robert "RO" Dixon Kristian Schmid as Leading Seaman Communicator Robert "RO" Dixon Ian Stenlake as Lieutenant Commander Mike "CO" Flynn Jeremy Lindsay Taylor as Petty Officer Bosun Peter "Buffer" Tomashevski Jeremy Lindsay Taylor as Petty Officer Bosun Peter "Buffer" Tomashevski John Batchelor as Chief Petty Officer Andy "Charge" Thorpe Kirsty Lee Allan as Able Seaman Rebecca "Bomber" Brown Josh Lawson as Able Seaman Cook Toby "Chefo" Jones Josh Lawson as Able Seaman Cook Toby "Chefo" Jones Conrad Coleby as Petty Officer Bosun Dylan "Dutchy" Mulholland Dominic Deutscher as Midshipman Ryan "Ry" White Danielle Horvat as Seaman Jessica "Gap Girl" Bird