Rey Mysterio To Return To Action On Raw Tonight

Kind of.
This is where he's failed a wellness test, likely steroid substitutes, where he's tried to cheat the system and failed.
This is where his popularity with the kiddies and the Hispanics saves his career, again (merch and ratings).
This is where he suffers a mysterious (no pun intended) elbow/knee/pinky finger injury and needs to go into surgery for a few weeks, and they write him off the show with a fake fake injury to cover up the real fake injury used to cover up the wellness test.

Cynical? Perhaps, but not without cause in Rey's case.