Question: What American actor also known for playing John Winchester on Supernatural, was also in the film Six: The Mark Unleashed?

Context paragraphs:
Matt Cohen (actor): Matthew Joseph "Matt" Cohen (born September 28, 1982) is an American film and television actor best known for playing young John Winchester and the archangel Michael in "Supernatural", Aiden Dennison on the teen drama series "South of Nowhere", and his current role as Griffin Munro on the ABC daytime soap "General Hospital".

Six: The Mark Unleashed: Six: The Mark Unleashed is a 2004 Christian action-drama film starring Stephen Baldwin, Kevin Downes, David A. R. White, Eric Roberts, and Jeffrey Dean Morgan.  It was released June 29, 2004, and debuted at #6 on the Christian Booksellers Association Best Sellers List.

David Ogden Stiers: David Ogden Stiers (born October 31, 1942) is an American actor, voice actor and musician, noted for his roles in Disney animated films, the television series "M*A*S*H" as Major Charles Emerson Winchester III and the supernatural fiction drama "The Dead Zone" as Reverend Gene Purdy.  He is also known for the role of District Attorney Michael Reston in several "Perry Mason" TV movies.

Jeffrey Dean Morgan: Jeffrey Dean Morgan (born April 22, 1966) is an American actor.  He is known for playing John Winchester on "Supernatural", Denny Duquette on the medical drama "Grey's Anatomy", The Comedian in the 2009 superhero film "Watchmen", Jason Crouse on "The Good Wife", and Negan on "The Walking Dead".

No Man's Land (2013 film): No Man's Land is a 2013 Chinese neo-western thriller film directed, co-written and co-produced by Ning Hao and starring Xu Zheng, Yu Nan, Huang Bo and Tobgye (Tibetan actor also known as Duobuji).

Sean Blowers: Sean Blowers (born 12 January 1961 in Middlesbrough, North Riding of Yorkshire) is an English actor.  He is well known for playing John Hallam in "London's Burning" from 1986 to 1996 and he has also been in "The Bill", "A Touch of Frost", "Dalziel and Pascoe", "Heartbeat", "New Tricks", "Casualty", "Staying Alive", "Crossroads", "Doctor Who", "EastEnders" and has appeared in films such as "The Krays", "Black Beauty" and "First Knight".

Brian Helicopter: Brian Helicopter is the stage name of Gareth Holder (born 27 June 1958, Leamington Spa), an English musician, based in the United States.  He is best known for playing bass guitar for the UK punk rock band The Shapes.  He also played for many other bands, the most notable being the NWOBHM bands Rogue Male and HellsBelles.  For a short time in the early 1980s, he was also a member of British R&B band The Mosquitos, with guitarist Steve Walwyn of Dr. Feelgood and Eddie and the Hot Rods, and can be seen on the cover of The Mosquitos only single "Somethin' Outta Nothin'".  A prolific session player, he appears both credited and uncreditied on many releases throughout the 1980s and early 1990s under both his real and stage name.  He was one of the first bassists in the nascent UK punk scene to adopt the Rickenbacker bass guitar which he still uses to this day.  He was also one of the first bass guitarists in the world to use Trace Elliot amplification.  His bass playing style is characterized by a very fast precise pick attack, and fast runs.  Unusually for a bass guitarist, he sometimes utilizes an overhand tapping technique more common to six string players.  He continues to play professionally, reverting between his real name and his stage name as the fancy takes him.  He is also a professional skydiving coach and instructor, currently holding seven world records in the sport.  He can be seen in an episode of MythBusters aired on the Discovery Channel taking presenter Kari Byron skydiving whilst testing the falling airplane blue ice myth.  He is also a vegetarian.  He can be seen in the independent film Six Sex Scenes and a Murder, in the role of the bounty hunter.  He currently resides in California, where he plays bass for the San Francisco Bay Area band Ghosthookers.  Ghosthookers released a record in 2008 which features Brian Helicopter on bass under his real name.

Timothy Moxon: Timothy Napier "Tim" Moxon (2 June 1924 – 5 December 2006) was an English-born actor, pilot and restaurateur who is probably best known for playing John Strangways, the character who uttered the first dialogue in the first James Bond film "Dr. No", and was the first character to die in the film series.

Charles Grant (actor): Charles Grant (born November 29, 1957), also listed as Charles Flohe or Charles Floye, is an American actor, most notably recognized for his role as Connor McCabe on NBC's soap opera "Santa Barbara".  He portrayed the role from 1992 to 1993.  His other soap roles include playing John 'Preacher' Emerson from 1982 to 1984 on "The Edge of Night", the first Evan Frame on "Another World" from 1988 to 1990.  He also played Grant Chambers on "The Bold and the Beautiful" from 1996 to 1998.

Jensen Ackles: Jensen Ross Ackles (born March 1, 1978) is an American actor and director.  He is known for his roles in television as Dean Winchester on The CW horror fantasy series Supernatural, Eric Brady in "Days of Our Lives", which earned him several Daytime Emmy Award nominations, as well as Alec/X5-494 in "Dark Angel" and Jason Teague in "Smallville".  He also starred as the lead in the box office success "My Bloody Valentine 3D" and portrayed Jason Todd in the popular animated film "".

Supporting paragraphs: Six: The Mark Unleashed Jeffrey Dean Morgan
Answer: Jeffrey Dean Morgan