He is best known for his work on radio and television, especially his portrayal of Mike Tucker in The Archers and Davros in three Doctor Who serials in the 1980s, a role he reprised for audio adventures.

Molloy was initially cast in the role by director Matthew Robinson, who had worked with him before and thought his talent for voices would be ideal to recreate the part first played by Michael Wisher.

He has also appeared on BBC 7 (now Radio4extra) in the role of Professor Edward Dunning opposite fellow Doctor Who actor Nicholas Courtney in The Scarifyers audio series, co-written by Paul Morris and Simon Barnard for Cosmic Hobo Productions.

[5] He appeared in this alongside a mix of modern and classic Doctor Who actors including; Nicholas Briggs, Richard Franklin, Simon Fisher Becker and Peter Davison.

Molloy's other TV credits include God's Wonderful Railway, Oliver Twist, The Real Eddy English, Tales of Sherwood Forest, Chalkface, The Bill, Casualty, and The Cleaner.