1x13 - Dogtanian and the Three Muskehounds

Dogtanian goes to the Musketeer's headquarters and joins the line waiting for a special guest, not realising it's him. Athos lifts him onto his shoulders and he gets a hero's welcome. When he goes in to meet Treville he finds out he can't become a Musketeer straight away, but as a reward for his bravery when fighting Widimer and the Guards he's allowed to visit the Palace Gardens...