#5 Big Show
Big Show returned to WWE last month on RAW, where he joined forces with Kevin Owens and Samoa Joe to take on the heel faction led by Seth Rollins. Show hasn't been on WWE television since, but recent reports suggested that he was to appear on this past week's RAW.
That didn't happen, but there's a possibility that Show could return at the Saudi Arabia PPV, perhaps coming to the aid of The Street Profits, who are set to face Rollins and Murphy for the RAW Tag Team titles.
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#4 Titus O'Neil
Titus O'Neil has a hilarious history with Saudi Arabia, as his "slide" botch at the Greatest Royal Rumble went viral. O'Neil hasn't wrestled on WWE television since November, with his last match coming on RAW when he faced Bobby Lashley.
We could maybe see him return to WWE at Super ShowDown, where he may possibly take part in a battle royal (if that happens), or in a tag team match, of sorts.