In episode 9, 'Pinball and Pierogies,' Ewan McGregor and Charley Boorman retrace their Long Way Round route from over 20 years ago and visit a Ukrainian refugee center, reflecting nostalgia and hope during this leg of their journey.

In episode 9, they visit a Ukrainian refugee center, implying interactions with refugees and possibly aid workers, though specific individual characters are not detailed in the available information.

Episode 9 features Ewan and Charley retracing their Long Way Round route from over 20 years ago, revisiting places and memories from that earlier journey, which adds a layer of nostalgia and reflection to the episode.

The episode is defined by nostalgia and hope as they revisit their old route and visit a Ukrainian refugee center; specific activities beyond this visit are not detailed in the search results.

The search results do not specify new challenges or obstacles in episode 9; the focus is on retracing their previous route and visiting the refugee center, emphasizing emotional and reflective moments rather than physical challenges.