Jessica Raine as Lucy Chambers
Peter Capaldi as Gideon
Nikesh Patel as Ravi Dhillon
Benjamin Chivers as Isaac Stevens
Talia Walker Bassols as Meredith Warren
Rhiannon Harper-Rafferty as Debbie Warren
Alex Ferns as Nick Holness
Meera Syal as Dr Ruby Bennett
Phil Dunster as Mike Stevens
Thomas Dominique as Lee Warren
Barbara Marten as Sylvia Chambers
Sandra Huggett as Karen Mulligan
Carys Gaylor as Chloe Fisher