Space Ace (Sega CD)

The evil commander Borf has kidnapped Ace's girlfriend, the beautiful Kimberly, and is plotting to enslave the Earth using his dreaded "Infanto Ray", a weapon that changes everyone it blasts into a helpless baby. Armed with only a laser gun, Ace must find and destroy the Infanto Ray, rescue Kimberly and save the Earth. All in a day's work for a superhero, right?