Rapid Regen (Rapid Regeneration) is a killstreak used by Medic class.
Requires 4 kills to activate.
Rapid Regen rapidly heals all allied heroes on the battlefield for 8 seconds. They start glowing green once the killstreak is activated.
This killstreak is used by all medics on the map in mission Doctors Of Doom but with no limit. That mission is the mission where Medic class is unlocked. In the last mission, Devs De La Muerte, Rapid Regen is used by the enemies same way as in Doctors of Doom. It is also one of the killstreaks in True Form of Justin and Mike in the penultimate phase of that mission.
Mayday, the unique Medic can use this killstreak.