Odyssey is the fourth studio album by guitarist Yngwie Malmsteen, released on 8 April 1988 through Polydor Records. The album reached No. 40 on the US Billboard 200 and remained on that chart for eighteen weeks, as well as reaching the top 50 in five other countries. As of 2017 it remains Malmsteen's highest-charting release on the Billboard 200. Steve Huey at AllMusic gave Odyssey two stars out of five, calling it "a more subdued, polished collection seemingly designed for mainstream radio airplay", but that it "shows little difference in approach from Malmsteen's previous output". He praised Joe Lynn Turner's vocals and Malmsteen's guitar work, but remarked that the latter sounds "constrained and passionless" due in part to his recovery from a near-fatal car accident in 1987.

Malmsteen's playing on the follow-up to the epochal Rising Force is slightly more raw and aggressive, but the most notable difference is the addition of lyrics on many of the songs. By his own admission, Malmsteen isn't much of a lyricist, and his frequent use of occult and pagan imagery (demons, Vikings, and so on) isn't as effective at producing a dark, gothic mood as his compositions and guitar playing are. Still, those aspects of the album are vital and stimulating, making Marching Out a worthwhile listen.

Yngwie Johan Malmsteen (born Lars Johan Yngve Lannerbäck, 30 June 1963) is a Swedish guitarist, songwriter, composer, and bandleader. Malmsteen first became known in the 1980s for his neoclassical playing style in heavy metal, and has released 21 studio albums in a career spanning over 40 years. In 2009, Time magazine rated Malmsteen as number 9 among the 11 greatest electric guitar players of all time.