From left to right:
Commander [Hubert] ‘Huntley’ Palmer (RNVR, League of Nations Patrol)
Lieutenant Byron Jones (Engineer) - name change
Hamilton ‘Ham’ Hammond (American Explorer / Journalist) New head
Patricia Hammond (nee Burlingame; Venus-born Biologist / Explorer) New uniform
I'm leaving the mad scientist unchanged, ditto (I think) the diplomat, though I'm horribly tempted to use the young Bela Lugosi instead.