Born Gloria Wood, the daughter of Hollywood filmmaker Sam Wood, K.T. Stevens began appearing on-stage and in films in childhood. She initially billed herself as Katharine Stevens. She played leads and supporting roles in numerous films during the '40s and '50s. Eventually she became a character actress. On television, she guest starred in numerous series and played Peggy Mercer on the soap General Hospital. She also played Helen Martin on the soap Days of Our Lives. At one time, she was married to actor Hugh Marlowe.