Rl'nnd is the son of Rm'twr, a Skrull who was killed by NASA head of security Carol Danvers long before she became Ms. Marvel.
As part of the Skrull Secret Invasion, Rl'nnd was first seen at an A.I.M. base preparing to go on a mission to find a Kree man; revealed to be Ms. Marvel's boyfriend, William Wagner. At the same time, a Skrull posing as Ms. Marvel had already got to Wagner.
Rl'nnd shapeshifts his way on to a S.H.I.E.L.D. Minicarrier after both the Skrull Ms. Marvel and the real Ms. Marvel are captured. Posing as a S.H.I.E.L.D. Agent Sum, Rl'nnd attempts to interrogate Ms. Marvel to learn the command codes to the S.H.I.E.L.D. Helicarrier but is quickly outed by Ms. Marvel and the two begin to battle. The culmination of the battle, Ms. Marvel's team use lethal force and kills Rl'nnd.