He was portrayed by Evan Jones.
Retch was a member of the Yondu Ravager Clan. During their stay at the planet Contraxia, Retch witnessed the arriving Sovereign High Priestess Ayesha as she offered them a reward for the capture of the Guardians of the Galaxy for the theft of the Anulax Batteries.
Retch went with the other Ravagers onto Berhert, where they manage to capture Rocket Raccoon and Groot as the other Guardians were being transported into the planet Ego. However, Rocket offered a deal to the Ravagers: he'll give them the batteries in exchange for his and Groot's safety, to which Yondu accepted by warning that killing the Guardians would put the entire Ravager clan in trouble with the Nova Corps. Though several Ravagers obliged to Rocket's deal, Retch was among the several Ravagers who refused to accept this, which incited the greedy Taserface to lead a mutiny against Yondu and his followers, even after Yondu and Rocket are knocked out by a freed Nebula.
With Taserface taking over as the new leader of the Ravagers, Retch joyfully took part in humiliating Yondu and Rocket, as well as killing the Ravagers who remained loyal to Yondu. Retch even took the time to put Groot in a Ravager suit and humiliate him by pouring alcohol in him, much to Groot's anger. However, Yondu's first mate Kraglin Obfonteri freed both Yondu and Rocket, who then finish off the mutineers in revenge for their treachery. Retch was able to avoid being struck by Yondu's arrow, but an angry Groot uses his vines to attack Retch and send him down falling to his death.