Groot was later tracked down and captured by S.H.I.E.L.D.’s Paranormal Containment Unit, nicknamed the Howling Commandos when his tree scent was detected by Sasquatch and Abominable Snowman. While Groot was being held captive, Gorilla-Man talked to Groot about joining the Howling Commandos.
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When Merlin and his forces attacked the base, the Howling Commandos let Groot and their other captives free and they stampeded on Merlin’s army; Groot was the only one to turn back and offered to join the Howling Commandos. Groot aided the Howling Commandos as they assaulted Merlin’s forces.