Star Wars Rebels writer Steven Melching has confirmed via Twitter that Captain Rex survives Star Wars Rebels and appears in Return of the Jedi.

https://twitter.com/stevenmelching/status/893935114845003776

I’m not to sure yet how I feel about this yet. I don’t think they are an exact match. I am happy though that now Rex officially appears in a live-action Star Wars film and we didn’t even know it. What do you think of this?