Horgan has appeared in several television productions including Peep Show, Traitors, The Rotter's Club, Genius: Picasso and Jane Eyre.

[6] In 2009 she appeared in a revival of Ferdinand Bruckner's Krankheit der Jugend ("Pains of Youth"), directed by Katie Mitchell, at the National Theatre.

[10][11] In 2011, she performed in The School for Scandal directed by Deborah Warner and written by Richard Brinsley Sheridan.

[5][12] From 2013 to 2015 she joined Sean Holmes ten-member Secret Theatre company at the Lyric Hammersmith,[5][13] which experimented with improvisational techniques towards drama.

Paul Taylor in The Independent wrote[19] "Cara Horgan is delectable in a double as the Russian maid who duets with Bourke in his hammy renditions of “Danny Boy” for his captors and as the wife in a CND couple who have an inconvenient marital meltdown while helping Blake on his first night outside" - Woyzeck - A Streetcar Named Desire - Chamber Piece - Glitterland - A Series of Increasingly Impossible Acts - Show 6 - A Stab in the Dark