One of the things that sets ATBG apart from so many others animated series is that nearly all main characters have a surprisingly dark side.
Dodie's one has always been her jealousy of everyone who could come between her and Ginger. So when Ginger returns to Sheltered Shrubs with Darren as her boyfriend you might expect problems. Yet you watch with open eyes as Miranda and Mipsy draw Dodie and Macie in a plot to break Ginger and Darren up.
The plot is further made stronger by Carl's storyline (which has the same theme, on another level) and the open ending.
Only weak spot in the storyline is the fact that writers in season three have no clue what to do with Courtney, she swithes sides so often that it is hard to follow.
All in all this is an excellent episode at the start of the show's last (and maybe best) season.