From Destinypedia, the Destiny wiki
Much like its Minor counterpart, the Overload Captain will keep its distance from the foes, while pelting their assailants heavy weaponry. These Captains' increased ability regeneration allows them to use their teleportation in quick succession, moving from one spot to another while dodging almost all incoming fire. To prevent this and allow the players time to sink some damage into the Captain, a Guardian should utilize Anti-Overload abilities, such as those obtained from the Seasonal Artifact, to disrupt their ability regeneration and stun the powerful Fallen champion, allowing time to do damage.
List of appearances