In 1995, Gunn played Sammy Capulet in the
B movie Tromeo and Juliet. In 2000, he guest starred in the second episode of
Gilmore Girls as Mick, a
DSL cable installer. As the first season continued, he was brought back in the recurring role of
Kirk Gleason, one of
Stars Hollow's most eccentric citizens. He was a regular cast member from 2002 to the series' end in 2007. He also had a recurring role on
October Road as Rooster. Although he is best known for his
Gilmore Girls role, he also has several television guest appearance credits, including
Angel;
3rd Rock from the Sun;
Yes, Dear;
True Jackson, VP;
Andy Richter Controls the Universe; and
Bunheads. He can also be seen in commercials as an "agent" for the
text message information service
KGB.com. In films, he has also had several roles, the most substantial being "Alien Orphan/Doug" in
The Specials, for which he also received a co-producer credit. In 2003, Gunn starred in the featurette
The Man Who Invented the Moon, directed by fellow
Goodman School of Drama alum and
Gilmore Girls cast member
John Cabrera. Gunn and Cabrera have been close artistic colleagues since their school days in
Chicago in the mid-nineties. Along with his brothers James and Brian, he is a creator and actor in the spoof-porn series ''
James Gunn's PG Porn. He also had a brief role as a computer maintenance man on the Nickelodeon show True Jackson VP
. He starred in a series of television commercials for Knowledge Generation Bureau, and appeared in the 2010 film Super'', written and directed by his brother
James. He is also the voice actor behind the character of Swan in the
Warner Brothers video game
Lollipop Chainsaw, also written by his brother James. Gunn guest-starred in the season 4 episode "
Makeover" of
Glee as committee member Phineas Hayes. In 2014, he provided
performance capture for the character of
Rocket, and played the role of
Kraglin,
Yondu Udonta's
second-in-command, in
Guardians of the Galaxy. In 2014, he held a supporting role in
Bones on
Fox in the episode "The Corpse at the Convention". In 2017, he reprised his role as Kraglin in
Guardians of the Galaxy Vol. 2, playing a larger part, and again provided performance capture for the character of Rocket. In 2018 he provided Rocket's motion capture in
Avengers: Infinity War and in
its sequel the next year. In 2021 he played the role of
Weasel as well as
Calendar Man in
The Suicide Squad Gunn reprised his role as Kraglin in 2022's
Thor: Love and Thunder,
The Guardians of the Galaxy Holiday Special and 2023's
Guardians of the Galaxy Vol. 3. In 2024, he reprised his role as Weasel in
Creature Commandos, while also voiced
G.I. Robot. In 2025, Gunn appears as
Maxwell Lord in
Superman. ==Personal life==