They really didn't make Julie Robinson very likeable, did they? Even when pursued by Peter Kirk you question why he'd be interested in her. And he's quite creepy himself.
She really goes to town here though, sticking the boot into her Jim and Anna's blossoming romance, even roping in Lucy (the original Lucy) to try and cause a rift.
Eventually it's Anna who does that herself, and the final scene is wonderfully written and performed.
There is more of the 'Shane and Danny' go fishing plot, but it's very thin stuff to flesh out the episode, and doesn't really go anywhere.
On the whole though, a good episode.