How to combine three many to many relationship results in a single collection in Laravel?

I have a many to many relationship between the following:

actor <-> theater_play, actor <-> musical, actor <-> ballet_play

How can I make a single array to display all the results from these relationships in Laravel?

I have now:

$actor->theaterPlays, $actor->musicals, $actor->balletPlays

And I need to have something like this:

$actor->allPerformances

via Chebli Mohamed