Stage shows by the Umbilical Brothers include Heaven by Storm (1996), Thwack (1999), SpeedMouse (2001), Don't Explain (2007), and Kidshow: Not Suitable For Children (2015).

Their collaborations began when Collins and Dundas were both studying at Theatre Nepean's three-year acting course at the University of Western Sydney.

Their tutors, perhaps believing a burgeoning comedy partnership should wait until after graduation, put Dundas and Collins in separate classes.

[citation needed] David won best actor at the world's biggest short film competition, Tropfest with Silencer, which he also co-wrote, co-directed and starred in.

He has also starred in the feature Red Christmas, as well as the TV shows Drop Dead Weird, Oh Yuck!, True Murder, The Letdown and Disney's Book of Once Upon a Time.

Short films include Puppets Versus People: Asylum (which has over a million views), Tay Man, Emissary, The Detectives Of Noir Town and The Kiss.

In August 2006, the Umbilical Brothers began appearing as the main characters on the Logie Award winning children's television program The Upside Down Show.