Viral Visitors is a co-op event match in Super Smash Bros. for Wii U. In it, player 1 controls Dr. Mario and player 2 controls Peach in a white alternate costume. They have 2 minutes to defeat 4 Dark Kirbys in their "unmasked Meta Knight" costume. Two Kirbys initially fight but more appear when one is defeated. The players have two stock while the opponents have one.
- This event is unlocked by clearing Scheming Sorcerer and unlocking Dr. Mario. Completing the event does not unlock any further paths.
- Completing the event within 60 seconds awards a Caloric Powerhouse Gloves equipment.
- The music used in this event, Chill (Dr. Mario) Ver. 2, normally plays on 75m, rather than Wuhu Island.
- This is the only event to feature Dr. Mario as a playable character since he's not playable in any solo events. This also occurs with Lucina in this event.
- This event can be considered an inverse of Melee's Event 35: Time for a Checkup where the players play as Dr. Mario and white dress Peach opposed to fighting them.