Dr. Mario

Dr. Mario (Dr. マリオ, Dr. Mario) is a playable character in Super Smash Bros. All Stars. His return to the series was officially confirmed on August 23rd, 2018 as part of a post-release announcement, during which Dark Pit was also confirmed. Like Dark Pit and Lucina, Dr. Mario was originally planned to be an alternate costume. However, all three were instead converted into being clones late in SSB All Stars'  development, with Masahiro Sakurai explaining that the reason for doing so in regard to Dr. Mario was in order to appeal to his fanbase from Super Smash Bros. Melee.

Dr. Mario is also the first of three Melee characters that were cut from Super Smash Bros. Brawl to return for SSB4, followed by Mewtwo and Roy. However, he retains his status as an unlockable character, whereas Roy and Mewtwo are now downloadable content. Charles Martinet reprises his role as Dr. Mario's voice actor, albeit via Mario's voice clips from Brawl. Additionally, Dr. Mario is less vocal than his normal self.

Dr. Mario is currently ranked 51st out of 58 on the tier list, placing him in the E tier. This is a significant drop from his placement in Melee, where his ranking of 11th out of 26 placed him in the mid-tier and higher than his normal self. While Dr. Mario's power has increased overall, his mobility has become noticeably slower and less nimble, with these traits having been implemented in order to differentiate him from Mario. Dr. Mario's recovery and combo game are also inferior to Mario's, which altogether have resulted in him having poor representation and below average results in competitive play.

While Dr. Mario is considered non-viable in competitive play, especially in comparison to his normal self, he has nonetheless achieved minor success as a niche character thanks to 2ManyCooks, Atomsk and Nairo.