Creator Backlash: Trash was his comeback album that brought him a level of success that he hadn't had in almost fifteen years but most of its lyrics were about sex, brothels or BSDM (a successful attempt to tap into the popularity of Mötley Crüe and Guns N' Roses). As a result of his renewed Christianity a few years later it's rare for Alice to perform any of its songs in concert, other than "Poison".
Donovan, of all people, duets with Alice on the title track to Billion Dollar Babies.
Again, of all people, Liza Minnelli (who Alice was dating at the time; he later joked that he "might've been her only straight boyfriend"), Ronnie Spector, and The Pointer Sisters contributed background vocals to both "Man With the Golden Gun" and "Teenage Lament '74" on Muscle of Love.
Vincent Price did a creepy monologue between "Devil's Food" and "The Black Widow" on "Welcome to My Nightmare".
And played "The Spirit of the Nightmare" on the TV special.
He also provided a creepy voiceover on "Coma" and "The Garden" by Guns N' Roses.
He had album-themed shows planned for both Goes to Hell and Welcome 2 My Nightmare ala the original Welcome to My Nightmare tour but neither panned out, the former due to illness and the latter due to lower-than-expected album sales.