The Other One is a British television comedy series broadcast on BBC One, written and directed by Holly Walsh and starring Ellie White, Lauren Socha, Rebecca Front and Siobhan Finneran.

The sitcom follows young Catherine "Cathy" Walcott (Ellie White) & her half sister, Catherine "Cat" Walcott (Lauren Socha), who had no idea of each other's existence until their father's untimely death at a birthday party.^[2]

Walsh was inspired to write the sitcom after hearing a true story about a man with two families who gave his kids the same name to avoid confusion or being sprung.^[3]

• Ellie White as Catherine "Cathy" Walcott, a woman who finds out she has a half-sister with the same name after her father's death
• Lauren Socha as Catherine "Cat" Walcott, Cathy's younger half-sister, who is introduced to her at her father's funeral
• Rebecca Front as Tess Walcott, Cathy's mother and the widow of Colin
• Siobhan Finneran as Marilyn, Colin's eccentric mistress and the mother of Cat; she suffered from agoraphobia
• Amit Shah as Marcus Tandell, Cathy's ex-fiancé
• Simon Greenall as Colin Walcott, Cathy and Cat's late father
• Caroline Quentin as Auntie Dawn (Tess's Sister)
• Shobu Kapoor as Mishti Tandell, Marcus' mother
• Silas Carson as Shray Tandell, Marcus' father^[4]
• Neil Pearson as Paul
• Stephen Tompkinson as Mr Shipham
• Maddie Rice as Meredith, Marcus' lover
• Christopher Jeffers as Callum (Series 2)
• Michele Austin as Angela, Callum's mother (Series 2)
• Lolly Adefope as Pretty Cathy, one of Cathy’s old school friends (Series 2)

Critic Emily Baker in the i newspaper gave the first episode four stars and commented on the “stellar acting”.^[5]