Zarathos appears in two flashbacks in SoV 16: his first chronological appearance (where he prepares to use the Medallion of Power) and another, where he fries Michael Badilino’s (who will later become Vengeance) father with hellfire.
Johnny Blaze appears in one as Ghost Rider, but this is currently attribute4d to SoV 15 and needs to be fixed.
GHOST RIDER XXXIV/JOHNNY BLAZE
…
M/TIO 80
**SOV 15-FB (delete)
*SOV 16-FB
MSU 6-FB
…
ZARATHOS [SPIRIT OF VENGEANCE]
*SOV 16 (12/13:6)-FB
GR3 42-FB-BTS
…
M/TIO 80
*SOV 16 (12/13:3)-FB
MSU 6-FB
…