Current
Jo Nunez Drums (2014-2017, 2018-present)
See also:
Firewind, Meridian Dawn, Dragonland (live), ex-Suicide of Demons,
ex-Negate (live), ex-Darkblazers, ex-Kamelot, ex-Nightrage, ex-Marty
Friedman (live), ex-About: Blank, ex-Mystica
Dennis Ward Vocals, Bass (2017-present)
See
also: Missa Mercuria, Panorama, Pink Cream 69, D.C. Cooper, Unisonic,
Magnum, Place Vendome, ex-Bob Catley, ex-Dezperadoz, ex-Wicked Sensation
Past
Or Lubianiker Bass (2014)
See also: Yossi Sassi Band, ex-Marty Friedman (live)
Marty O'Brien Bass (2014-2015)
See also: ex-Emissary, ex-Kilgore, ex-Methods of Mayhem, ex-We Are the Fallen
Jeff Scott Soto Guitars (2014)
See
also: Bakteria, Sons of Apollo, Trans-Siberian Orchestra, Jeff Scott
Soto, SOTO, W.E.T., ex-Axel Rudi Pell, ex-Yngwie J. Malmsteen,
ex-M.A.R.S., ex-Panther, ex-Eyes, ex-Humanimal, ex-Skräpp Mettle,
ex-Takara, ex-Talisman, ex-Journey (live), ex-Vinnie Vincent (live)
Henning Basse Vocals (2014-2016)
See
also: Firewind, Hollentor, Hypnoside, Orpheus Blade, Mayan (live),
ex-Errantry, ex-Metalium, ex-Karmaflow (live), ex-Bourbon Street,
Skyline, ex-Brainstorm, ex-Gamma Ray (live), ex-Sons of Seasons
Mats Levén Vocals (lead), Guitars (acoustic) (2014-2015)
See
also: Aeonsgate, Cem Köksal, Ludor, Trans-Siberian Orchestra (live),
ex-Abstrakt Algebra, ex-Southpaw, ex-Krux, AB/CD, FAT.MO.MAC, ex-At
Vance, ex-Candlemass, ex-Fatal Force, ex-Yngwie J. Malmsteen,
ex-Firewind (live), ex-Therion (live), ex-Adagio, ex-Sabbtail,
ex-Capricorn, ex-Dogface, ex-Swedish Erotica, ex-Treat, ex-Anette Olzon
(live), ex-Symphonic Rhapsody of Queen (live)
Strutter Bass (2015-2016, 2017)
See also: Diary of Secrets, Wardrum
Taylor Nordberg Bass (2016-2017)
See
also: Dritt Skit, Goregäng, Infernaeon, Ribspreader, Scab, The Absence,
ex-Wombbath, ex-Necromancing the Stone (live), ex-Soilwork (live)
Jeramie Kling Drums (2016)
See
also: Dritt Skit, Goregäng, Infernaeon, Necromancing the Stone, Ninety
Minute Reflex, Ribspreader, The Absence, Venom Inc., Scab (live),
ex-Skineater, ex-Wombbath
Alex Bent Drums (2016-2017)
See
also: Dragonlord, Trivium, Underling, ex-Brain Drill, ex-Arkaik,
ex-Battlecross, ex-Hatriot, ex-Monumental Torment, ex-Decrepit Birth
(live), ex-Rings of Saturn (live), ex-Testament (live), ex-Angel Vivaldi
(live)
Rob Rock Vocals (2016-2017)
See also: Driver,
Impellitteri, Rob Rock, ex-Fires of Babylon, ex-M.A.R.S., ex-Axel Rudi
Pell, ex-Joshua Perahia, ex-Mistheria, ex-Warrior, ex-Vice, ex-Angelica
Richie Monica Drums (2017-2018)
Elize Ryd Vocals (2017)
See also: Raskasta Joulua, Amaranthe, ex-Kamelot (live), ex-Nightwish (live), ex-Avalanche
Felix Bohnke Drums (2018)
See
also: Edguy, Avantasia (live), ex-Saints & Preachers, Sascha
Paeth's Masters of Ceremony, ex-Taraxacum, ex-Exiled, ex-Merciless Gnom

Two different projects, a few years apart, united under Gus G.'s name. The first album is an all-instrumental guitar showcase, while the later ones feature a number of guest vocalists, and have a noticeably more commercial appeal.