The streaming service posted on Twitter a photo of a script for the first episode called "Let's Begin" on Friday.
"A little more news - @veryvness and @peytonlist will be returning as series regulars, and we have some new faces joining us this season,
The streaming service didn't say who Young and O'Brien would play.
The half-hour, action-dramedy picks up more than 30 years after
Now in their 50s, down-on-his-luck Johnny and wealthy hotshot Daniel are martial arts instructors with their own dojos where they mentor teens using vastly different teaching and fight techniques.
Season 3 ended with the pair agreeing to join forces to take down a common enemy.
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