Question: Tommy Henriksen was part of the rock supergroup formed by Alice Cooper in which year?

Context paragraphs:
Hollywood Vampires (band): Hollywood Vampires is an American rock supergroup formed in 2015 by Alice Cooper, Johnny Depp and Joe Perry to honor the music of the rock stars who died from excess in the 1970s.  The band name derives from The Hollywood Vampires, a celebrity drinking club formed by Cooper in the 1970s which included but was not limited to: John Lennon and Ringo Starr of The Beatles, Keith Moon of The Who, and Micky Dolenz of The Monkees.  Touring members include or have included Duff McKagan and Matt Sorum of Guns 'N Roses fame, as well as Robert DeLeo from Stone Temple Pilots.

Welcome to My Nightmare: Welcome to My Nightmare is the eighth studio album by Alice Cooper, released in March 1975.  This was Alice Cooper's first solo album (all previous Alice Cooper releases were band efforts), and his only album for the Atlantic Records label.  The ensuing tour was one of the most over-the-top excursions of that era.  Most of Lou Reed’s band joined Cooper for this record.

Nights with Alice Cooper: Nights with Alice Cooper is a radio show hosted by Detroit born rock and roll artist and shock rock pioneer Alice Cooper.  It is syndicated by United Stations Radio Networks and broadcast on a wide variety of affiliate radio stations in the United States, Canada, the United Kingdom, Australia, New Zealand, and Europe.  The most recent show is also streamed online in a continuous loop by Radionomy; this stream is also used for the official "Nights with Alice Cooper" app for iOS and Android, which additionally offers "exclusive content" as well as interaction with other fans.

Tommy Henriksen: Tommy Henriksen (born February 21, 1964) is an American musician from Port Jefferson, New York best known for his work as a guitarist, bassist and songwriter with Alice Cooper, the Hollywood Vampires and German metal band Warlock.  He has also fronted punk rockers P.O.L. and released several albums as a solo artist.  In addition, Henriksen is a sought-after songwriter, arranger, producer and mixer who has worked with artists such as Lady Gaga, Meat Loaf, Lou Reed, Halestorm, Kesha, and Daughtry.  Henriksen is currently based out of Zurich, Switzerland where he lives with his family.

Good to See You Again, Alice Cooper: Good to See You Again, Alice Cooper is a 1974 feature film starring Alice Cooper.  The movie primarily features live concert footage of the Alice Cooper band on their record-breaking "Billion Dollar Babies" tour, filmed in Texas (mostly at the Sam Houston Coliseum) in April 1973, with some footage from other tour stops, including the Memorial Coliseum, Portland, Oregon, intercut with 'comedy' scenes of a German film director chasing the "Cooper gang" for revenge after they abandoned his would-be masterpiece movie.

Paranormal (Alice Cooper album): Paranormal is the 27th studio album by Alice Cooper, released on July 28, 2017.  It features two tracks performed by the "classic" line-up of the Alice Cooper band (Neal Smith, Dennis Dunaway, and Michael Bruce) plus Larry Mullen Jr. from U2, Roger Glover from Deep Purple, Billy Gibbons from ZZ Top, Swedish songwriter and session guitarist Tommy Denander, Alice Cooper bandmate Tommy Henriksen, Steve Hunter and more.

Welcome to My Nightmare (film): In 1975, Alice Cooper released his first solo album, "Welcome to My Nightmare", and a huge theatrical stage show was created and put together by Winters to 'tour the album'.  Whilst in the past the Alice Cooper stage show was semi-improvisatory, with confrontational elements of violence and satire (see "Good to See You Again, Alice Cooper"), the new production was purely horror-themed and professionally choreographed and performed to the split second (Winters had a long history of choreographing and directing big celebrity films, stage and TV shows starring in the cast of West Side Story and choreographing 4 films with Elvis Presley and 5 films with Ann-Margret).  With the edginess removed (gone were the bloody guillotine, the spit and the skewered baby dolls, although "Only Women Bleed" presented a drunken, physically abusive side to the character), the "Welcome to My Nightmare" show was part a carefully planned move toward a more mainstream-friendly 'Alice'.

Pretties for You: Pretties for You is the debut album by Alice Cooper.  It was released in June 1969 by Straight Records.  At this time, the name "Alice Cooper" referred to the band, not its lead singer Vincent Furnier, although he was later also known as Alice Cooper.  The music has a psychedelic flavor to it; the group had yet to develop the more concise hard rock sound that they would become famous for.  Most of the tracks feature unusual time signatures and arrangements, jarring syncopation, expressive dynamics, sound effects, and an eclectic range of music influences.  A few songs, such as "Levity Ball," show the influence of Syd Barrett-era Pink Floyd, with whom Alice Cooper hung out during the British group's U.S. tour.  Too bizarre and avant-garde for its time, "Pretties for You" was a critical and commercial failure, only briefly denting the "Billboard" Top 200, and none of its songs have ever been played live by Cooper since the release of the band's breakthrough album "Love It to Death".

Poison (Alice Cooper song): "Poison" is a song by American rock singer-songwriter Alice Cooper.  Written by Cooper, Desmond Child, and John McCurry, the song was released worldwide as a single in late-1989 from Cooper's eighteenth album, "Trash" (1989).  The song was one of Cooper's biggest hit singles in the United States, peaking at number 7 on the "Billboard" Hot 100, while peaking at number 2 in the UK Singles Chart, only being held off the top spot by the dance record, "Swing the Mood" by Jive Bunny & the Mastermixers.  "Poison" is one of Alice Cooper's best known songs.  It is ranked by "Billboard" as the "91st top song of 1989", while Ultimate Classic Rock ranked it as the "6th best Alice Cooper song", commenting "Poison sounds like a typical ’80s pop-metal number at times, but Cooper’s intensity brings it to a whole other level."

Neal Smith (drummer): Neal Smith (born September 23, 1947) is an American musician, best known as the drummer for the rock group Alice Cooper from 1967 to 1974.  He performed on the group's early albums "Pretties for You" and "Easy Action", the breakout album "Love It to Death" and the subsequent successful albums "Killer", "School's Out", and "Billion Dollar Babies".  His last album with Alice Cooper was "Muscle of Love".  In 2011, Smith was inducted into the Rock and Roll Hall of Fame, in the "Performer" category, as a member of the original Alice Cooper band.

Supporting paragraphs: Tommy Henriksen Hollywood Vampires (band)
Answer: 2015