The official Hélène et les Garçons YouTube channel features many full episodes. YouTube’s are surprisingly good for this series due to the clear studio audio. While not perfect ("Hélène" might become "elle laine"), they are a free and legal option.
The most reliable way to watch the series with high-quality French subtitles is through official streaming services. In many regions, the show is available on platforms like YouTube (via the ABPI or Hélène et les Garçons official channels) or Amazon Prime Video. helene et les garcons subtitles french
For language acquisition, the sitcom format offers unique advantages: The official Hélène et les Garçons YouTube channel