Jason Isaacs Jason Isaacs is a British actor who portrayed Captain , commanding officer of the USS " Discovery " , in . He is best known for playing Lucius Malfoy in the " Harry Potter " film franchise . In March 2017 , it was announced that Isaacs was cast as Captain Lorca in " Star Trek : Discovery " . For his role as Lorca , Isaacs was nominated for an Empire Award for Best TV Actor and a Saturn Award for Best Actor on a Television Series . Career . Isaacs first became known to American movie - going audiences portraying NASA physicist Ronald Quincy in the 1998 Jerry Bruckheimer - produced , Michael Bay - directed hit " Armageddon " , co - written by J . J . Abrams and working alongside Jeff Austin , Brian Brophy , Jim Fitzpatrick , Anthony Guidera , John Mahon , J . Patrick McCormack , Marshall Teague , Peter White , and Lawrence Tierney . Isaacs reteamed with Bruckheimer as Army Ranger operative Mike Steele in the 2001 war epic " Black Hawk Down " . Set during the disastrous raid in Mogadishu , Somalia in 1993 , Isaacs costarred with Eric Bana , Tom Hardy , Glenn Morshower , and Enrique Murciano . Other military roles include " Soldier " ( 1998 ) with Elizabeth Dennehy and the villainous British army officer Tavington in 2000 ' s " The Patriot " , co - starring Rene Auberjonois and Leon Rippy . Stepping out of military roles , Isaacs co - starred in the supernatural 2000 television film " The Sight " , with Kevin Tighe . In 2001 , Isaacs transitioned to romantic fare beginning with " Sweet November " with the likes of Robert Joy and Frank Langella . 2002 found Isaacs making a return to military drama co - starring in " Windtalkers " with Holmes R . Osborne and Christian Slater . That year Isaacs appeared as Charles Beck in " Passionada " , which co - starred Seymour Cassel . Finally that year was " High Times Potluck " opposite Frank Gorshin . Isaacs joined veteran Colm Meaney in 2004 ' s " Battle of the Brave " . Isaacs would appear uncredited in the 2005 superhero film " Elektra " costarring TNG guest Cary - Hiroyuki Tagawa . That year Isaacs was back in romantic films costarring in " Nine Lives " with K Callan . Following this Isaacs made a foray into comedy in the sports - themed " Tennis , Anyone " with Debra Wilson . For 2007 , Isaacs was seen in the Robert Rodriguez / Quentin Tarantino anthology film " Grindhouse " where Isaacs joined James Parks and Tom Towles . Isaacs is also known for his voiceover work in video games . He was the voice of the villainous Ra ' s al Ghul in 2010 ' s " Batman : Under the Red Hood " with Brian George , Bruce Greenwood , Dwight Schultz , and Wade Andrew Williams followed by " Castlevania : Lords of Shadows " and its 2014 sequel " Lords of Shadow 2 " both times with Patrick Stewart . Isaacs ' other work that year included the telefilm " Pleading Guilty " where he was joined by Mädchen Amick , John Larroquette , and Leland Orser . In addition to " Harry Potter " , Isaacs joined another franchise lending his voice to " Cars 2 " with DS9 recurring actor Paul Dooley . 2013 saw Isaacs costarring in the telefilm " The Surgeon General " joining Clancy Brown . Isaacs was on the big screen in " Sweetwater " opposite Stephen Root . Isaacs worked in 2014 ' s " After the Fall " with Keith Carradine . That year , Isaacs costarred in the NBC remake of " Rosemary ' s Baby " starring Zoë Saldana in the title role whereas the original costarred Gail Bonney and Elisha Cook . Isaacs also portrayed the primary antagonist , , in the first season of " Star Wars Rebels " , in which Brent Spiner also had a recurring role . Isaacs concluded the year in the World War 2 film " Fury " with Brad William Henke . In 2015 , Isaacs won a role in " Stockholm , Pennsylvania " with past Trek actors Rosalind Chao and Tom Wright . Next , Isaacs was back in video game voiceover work with " Justice League : Gods & Monsters " alongside Larry Cedar , Penny Johnson , Bruce Thomas , and Marcelo Tubert . With Alice Eve joining him , Isaacs starred in the title role of the short film " Lithgow Saint " . As a performer on series television , Isaacs appeared as British photojournalist Simon Ayres on " The West Wing " in 2004 , appearing in the penultimate and final episodes of the fifth season ( with Terry O ' Quinn ; Ron Canada , Steven Culp , and Natalija Nogulich ) and the sixth season premiere . Isaacs also guested on the HBO comedy " Entourage " in 2008 with Alan Dale . Isaacs ' first starring role was as Irish - American mobster Micheal Caffee in the Rhode Island - set " Brotherhood " which aired on Showtime . Isaacs ' character was a fictional analogue of real - life Boston mob figure Whitey Bulger . On that series his mother was played by Fionnula Flanagan .