Guest Stars Iwan Rheon as Rob Tanya Reynolds as Gwynn Steve Speirs as Steve Rhodri Miles as Doctor Rebecca Jade Hammond as Meg Nia Trussler Jones as Dog Walker 1 Daniel Lloyd as Singer Sasha Latoya as Ciara Bethan Bevan as Dog Walker 2 Hannah Cadec as Mermaid Bois Y Bryn as Shanty Singers
