Hi @bhireg0,
A warm welcome here in the Roku Community!
We're glad to assist you with your problem with your audio on Classic Doctor Who. Do you have any other devices connected to your TV? (e.g., speakers and other sound systems). Can you please check the volume level and mute settings on your TV using your remote? You can check out this link here for details on how to adjust and use volume modes on your Roku Ultra so you can adjust it to your liking.
Let us know if this works.
All the best,
Eunice
Eunice L.
Roku Community Moderator