Is it just on one episode or all episodes? Now that we know this is on The Roku Channel, if you tell us which season and episode to try we can see if we get the same thing.
It's possible the episode may have been programmed with the wrong audio track, or there could be several to choose from. On a Roku device the default way to get to the choice of audio tracks is to press the Options (*) key on the Roku remote while playing the program and see the available options.
But for the ROKU CHANNEL app installed on a non-Roku TV set, Roku must adapt the version of its app for each brand of TV on which it is to be run, to accommodate the set's operating system and available controls. One common control choice could be to press the up or down key on your remote to pop up the options, if there are any, on the screen.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
