Looked up Captain Pugwash using Google - a web page came up which has urban myths. This has been clipped from the page - quote from the (Manchester) Guardian

JOHN RYAN: CAPT. PUGWASH

In the Young Guardian of September 13 we stated that the Capt. Pugwash cartoon series featured characters called Seaman Staines and Master Bates, and for that reason the series had never been repeated by the BBC. We accept that it is untrue that there ever were any such characters. Furthermore, the series continues to be shown on television and on video.

We apologise to Mr. Ryan, the creator, writer and artist of the Captain Pugwash films and books. We have agreed to pay him damages and his legal costs.

\endquote

The cabin boy was not called Roger, but Tom. So there goes another bit of it. As I remember, two of the crew were Pirates Willy and Barnabas, and there may have been a M[ai]ster Mate, which may have been the source for the story.

An interactive story can be found on this web page: http://ourworld.compuserve.com/homepages/taylornm/Pugwash.htm

Indeed it confirms Master Mate and Willy and Barnabas.

Rana