Zombie titles and Sega, at one time, were synonomous with each other. Sega was quite prolific in releasing games with zombies in them at a regular clip, that was when they were hungry. This was a golden age for gamers as Sega was being innovative and interesting with releases. Gamers got zombie games that taught typing, ones that featured light guns and we got a beat em up called Zombie Revenge (sadly, no kart racing game with zombies).
While not super interwoven with the House of the Dead series, Zombie Revenge does pay homage to that series in subtle ways. ZR is essentially Final Fight meets a George Romero flick coupled with that trademark Sega wackiness. Playing Zombie Revenge on the Dreamcast was a blast, even though some enemies are beyond cheap, it had that capability to urge you on for just one more play.
How many references to the original House of the Dead lightgun game can you find/remember? Grab a copy of Zombie Revenge off of Ebay today.