Inatimenowlostinthemistsofmemory,thegreatKingArthurrulesinthelegendarycitadelthatisCamelot.HisKnightsoftheRoundTableperformactsofderring-doandspendtheirsparetimejousting,muchtothedelightofthelocalcitizensandespeciallytoPrincessIlene,aguestatCamelot.Watchingherfromafarisayoung,inexperiencedsquirecalledValiant,andwhentheyoungWelshprincessissenthometomarryPrinceArn,ValiantcontrivestoaccompanyhermasqueradingasSirGawain.Meanwhile,theevilsorceressMorganleFey,sistertoKingArthur,hasconvincedthetyrannicalSligon,ruleroftheVikingkingdomofThule,thatheshouldstealArthur'ssword,thepowerfulandmagicalExcalibur,knowingthatitslosscouldbringaboutArthur'sdownfall.SointothefraycomesSligon'sunstableandpsychoticbrotherThagnar,whomanagestostealthesword.Pandemoniumreigns.ButValiantishavingproblemsofhisown-kidnappersattempttostealawaythePrincess,andaftervariousskirmishes,includingonewithamysteriouscharacterwholivesinacaveandpurloinstreasure,womenandotherthingsofvalue,ValiantmanagestoreturnthePrincesstoherhomeland-althoughhealsomanagestohaveaduelwiththePrincess'jealousfiancé,PrinceArn.AllthingsconvergeasValiantisfinallyinformedofhisheritagebythestrangerfromthecave...BoltarofThule.HeinformstheladthatheisPrinceValiant,rightfulheirtothekingdomofThule,andwithhishelp,Valiantreturnstothelandofhisbirthtorightfullyclaimwhatishis.