Linus Roache and Geraldine Somerville will topline ITV’s four-hour mini, which also stars Celia Imrie, Toby Jones (“Captain America: First Avenger”), Perdita Weeks, Lee Ross (“Centurion ...

Written by Julian Fellowes (“Downton Abbey”) and starring Linus Roache (“Law & Order”) and Geraldine Somerville (“Harry Potter” franchise), “Titanic” continues Fellowes' penchant ...