Is there a better possible double bill in hard rock than Rob Zombie and Marilyn Manson? The two defined theatrical heavy metal in the 1990s, and both of them have demonstrated far greater longevity and creativity than any of their critics would have ever given them credit for. Both have developed into mature artists while retaining the over-the-top flourishes that defined their early careers.

Zombie started as frontman for heavy metal band White Zombie (“Thunder Kiss ’65,” “More Human Than Human”), and after the group’s members went their separate ways in 1998, Zombie launched an even more successful solo career, bringing his horror-influenced metal to hits including “Dragula,” “Living Dead Girl,” “Demon Speeding” and others.

Manson, pictured, courted controversy in his early releases, with confrontational songs like “The Beautiful People,” “The Dope Show,” “Antichrist Superstar” and his take on “Sweet Dreams (Are Made of This),” and he’s continued pushing the envelope on recent albums, including 2017’s Heaven Upside Down. Like Zombie, he’s likely to play a mix of hits and newer material, and the two performers may just try one-upping each other in their stage productions in Vegas. They really do make a perfect pairing.

MGM Grand, 7 p.m. Aug. 25, $44-$99.50 plus tax and fee. 800.745.3000 Ticketmaster