"John Alderton - Sam Jones, Elvis Cridlington, Station Officer Steele, Penny Morris, Trevor Evans, Dilys Price, Bella Lasagne, Norman Price, Sarah Jones, and James Jones (1987-1994)"

"John Sparkes - Sam Jones, Elvis Cridlington, Station Officer Steele, Mike Flood, Tom Thomas, Trevor Evans, Dilys Price, Norman Price and Dusty (2005)"

"Joanna Ruiz - Sarah Jones, and James Jones (2005)"

"Sarah Hadland - Penny Morris, Bella Lasagne, Mandy Flood, and Helen Flood (2005)"

"Steven Kynman - Sam Jones, Elvis Cridlington, Norman Price, James Jones and Jerry Lee Cridlington (2008-present)"

"David Carling - Station Officer Steele, Mike Flood, Tom Thomas, and Trevor Evans (2008-2024)"

"Su Douglas - Dilys Price, Helen Flood, Mandy Flood and Lily Chen (2008-present)"

"Tegwen Tucker - Penny Morris, Sarah Jones and Mrs. Chen (2008-present)"

"Ifan Huw Dafydd - Gareth Griffiths (2012-present)"

"Nigel Whitmey - Moose Roberts (2012-present)"

"John Hasler - James Jones and Arnold McKinley (2012-present)"

"Alex Lowe as Ben Hooper, Joe Sparkes and Professor Pickles (2014-present)"

"Jo Wyatt as Hannah Sparkes and Lizzie Sparkes (2014-present)"

"Harriet Kershaw as Ellie Phillips (2014-present) and Bella Lasagne (2016-present)"

"David Tennant as Buck Douglas (2016-2017-Alien Alert only)"

"John Barrowman as Flex Dexter (2018-Set for Action! only)"

"Kerry Shale as Don Sledgehammer (2018-Set for Action! only) and Dr. Crumpton (2020-Norman Price and the Mystery of the Sky only)"

"Colin McFarlane as PC Malcolm Williams (2020-present)"

"Sasha Behar as Sgt. Rose Ravani (2020-Norman Price and the Mystery of the Sky only)"

"Denise Van Outen as Professor Polonium (2020-Norman Price and the Mystery of the Sky only)"