Welcome to Star Trek Answers. What would you like to know?

You're referring perhaps to NICK TATE who portrayed Alan Carter in Space 1999.

Nick portrayed the following characters

TNG: "Final Mission", as Dirgo

DS9: "Honor Among Thieves", as Liam Bilby

can you be more specific? which actor?

Yes, that's him. The Australian guy. There was also a reference to the Australians in the Star Trek: Deep Space Nine episode "Little Green Men".

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