Mark is best known for Star Wars naturally, however he actually has a substantial history of voice acting for both DC and Marvel.
After two episodes as The Trickster/James Jesse in the 1991 DC television series The Flash, he’s voiced the following:
— The Joker in Batman: Mask of the Phantasm (1993, DC)
— The Joker, Jack Napier, and a waiter in Batman: The Animated Series (1992-94, DC)
— The Joker in The Experiences of Batman and Robin (1995, DC)
— Maximus, Sentry, and Triton in Fantastic Four: The Animated Series (1995-96, Marvel)
— The Joker in The Adventures of Batman and Robin Activity Center (video game, 1996, DC)
— The Joker in Superman: The Animated Series (1997, DC)
— Gargoyle and Tong-Zing in The Extraordinary Hulk (1996-97, Marvel)
— Hobgoblin, Jason Phillips, Jason Philip Macendale in Spider-Man (1995-98, Marvel)
— The Joker and a mugging victim in The New Batman Adventures (1997-99, DC)
— Carter in Batman of the Future (2000, DC)
— The Joker in Batman Beyond– Return of the Joker (2000, DC)
— The Joker and Dr. Isaac Evers in Batman: Revenge (computer game, 2001, DC)
— The Joker in Static Shock (2002, DC)
— The Joker in Birds of Prey (2002, DC)
— Wolverine in X-Men 2: Wolverine’s Revenge (video game, 2003, Marvel)
— Solomon Grundy, The Joker, and a customer in Justice League (2002-03, DC)
— The Joker in Batman: New Times (2005, DC)
— The Joker in The Total Robin Storyboard Series (2005, DC)
— The Trickster/James Jesse in Justice League Unlimited (2006, DC)
— Oiler in Ultimate Avengers II (2006, Marvel)
— Tony Zucco in The Batman (2006, DC)
— The Joker and Scarface in Batman: Arkham Asylum (2009, DC)
— The Spectre in Batman: The Brave and The Bold (2010, DC)
— Red Skull in Marvel Super Hero Team: The Infinity Onslaught (computer game, 2010, Marvel)
— Ulysses Klaw/Klaw in The Avengers: Earth’s Mightiest Heroes (2010, Marvel)
— The Joker in DC Universe Online (computer game, 2011, DC)
— Chthon and Red Skull in The Super Hero Team (2010-11, Marvel)
— The Joker in Batman: Arkham City (2011, DC)
— Red Skull in Marvel Super Hero Squad: Comic Combat (computer game, 2011, Marvel)
— The Joker in Batman: Arkham City Lockdown (computer game, 2011, DC)
— The Joker in DC Universe Online: The Last Laugh (video, 2012, DC)
— The Joker in Batman: Arkham Knight (computer game, 2015, DC)
— The Trickster and Sinestro in Lego DC Super Heroes: Justice League– Attack on the Legion of Doom! (2015, DC)
— Arnim Zola in Lego Marvel’s Avengers (video game, 2016, Marvel)
— The Joker in Batman: The Killing Joke (2016, DC)
— The Joker in Batman: Arkham VR (2016, DC)
— Arnim Zola, Nightmare, and Ox in Ultimate Spider-Man (2012-16, Marvel)
— The Joker in View-Master Batman Animated VR (computer game, 2016, DC)
— James Jesse/The Trickster in The Flash (2015-16, DC)
— The Joker in Arkham Asylum VR Rollercoaster (2017, DC)
— The Joker, Trickster, and Swamp Thing in Justice League Action (2016-18, DC)
— The Joker, Trickster, and Overload Thing in Justice League Action Shorts (2017, DC)
— Arnim Zola in Spider-Man (2018, Marvel)
— The Joker, Trickster, and Director in Lego DC Super-Villains (2018, DC)
— Arnim Zola/Cap Zola in Avengers Put together (2017-18, Marvel)
As well as all of the above, he’s voiced the Joker in an episode of Robot Chicken and the Trickster and Joker in Scooby-Doo and Guess Who? Essentially, if you hear the Joker in a cartoon, you can put cash on it being Mark.He also appeared in Kingsman: The Secret Service, which isn’t a Marvel or DC comic, however is based upon a comic by Kick-Ass developer Mark Millar. A great deal of people on this crossover list likewise appear to have a crossover with the Millarverse!
Source: https://www.buzzfeed.com/rhiannacampbell/actors-in-both-marvel-and-dc-movies