Didn't [Ultraman] take over where Speed Racer and Tobor the 8th Man left off ?
Speed Racer never fought monsters. But as a sidenote, SNL's TV Funhouse spoofed Speed Racer.
Speedy and Chim Chim enter the Mach in a NASCAR event. The NASCAR guys attack Speed Racer's "rice burner" and his manhood. Things get rowdy as the NASCAR guys have the upperhand. Suddenly, Speedy's crewchief summons all the japanese cartoons to join the battle. It gets ugly when the cute Pokemon demon lays waste all NASCAR combatants.
I was near tears with laughter. E! aires reruns of this year's SNL. If you can stomach the idiocy of SNL to get to TV Funhouse it's worth the effort.