Many wrestlers have had very successful careers while masked such as The Destroyer/Dr. X, Mr. Wrestling, Masked Superstar and the Spoiler. In the days where professional wrestling was more regional, with less national television coverage, it was not uncommon for more than one person or team to use the same gimmick and mask, and there have at times been several masked "Interns", "Assassins" and "Executioners" working simultaneously. Tag team wrestling has seen more masked teams, using identical masks to create unity between wrestlers. Successful masked teams include the Masked Assassins, Blue Infernos and the Grapplers.