#3. Jeff Hardy
It's already been announced by WWE that Jeff Hardy will be making his return to the SmackDown brand on Friday night, but that doesn't eliminate him from being a potential suspect.
Hardy has always been someone who enjoys pyrotechnics and as a star who has been part of WWE for a number of years, he would definitely know how to infiltrate the production truck. Hardy's brother Matt has recently left WWE and could be looking to join AEW in the coming weeks, which means that Hardy will be in WWE without his brother for the first time in his career.
Could Hardy be set to debut a new character upon his return? Hardy's brother Matt interestingly Tweeted earlier in the week calling him Brother Nero, which could be a hint that Hardy has decided to bring his former Impact character over to WWE as well.
Could Brother Nero be the one who's managed in take over SmackDown over the past few weeks and could he be set to bring other members of the family with him?