He voiced all the characters in [[Britt Allcroft]]'s television series ''[[Magic Adventures of Mumfie]]'' (except for The Queen of Night who was instead voiced by Allcroft). He was originally hired to voice Splatter and Dodge in ''[[Thomas and the Magic Railroad]]'', but the roles were instead recast to [[Neil Crone]] and [[Kevin Frank]].
Breen appeared regularlyin a recurring role in [[Netflix]]'s adaptation of ''[[A Series of Unfortunate Events (TV series)|A Series of Unfortunate Events]]'', which premiered in 2017.<ref>{{cite web|url=https://www.romper.com/p/who-plays-larry-the-waiter-on-a-series-of-unfortunate-events-patrick-breen-has-become-a-fan-favorite-8633565|title=Who Plays Larry The Waiter On 'A Series Of Unfortunate Events'? Patrick Breen Has Become A Fan Favorite|first=Zakiya|last=Jamal|date=March 30, 2018|work=Romper|accessdate=January 9, 2019}}</ref>
