Question: Name the American actor, best known for his role as Captain B.J. Hunnicutt in a television series which included a 2-episode story arc where we see the departure of Captain Trapper and his replacement by this new Captain? 

<P0-S0>  He is an activist for various political causes. <P0-S1> Michael Joseph Farrell, Jr. (born February 6, 1939) is an American actor, best known for his role as Captain B.J. Hunnicutt on the television series "M*A*S*H" (1975–83). <SEP> <P1-S0> "Welcome to Korea" was a 2-episode story arc, the 73rd and 74th episodes of the "M*A*S*H" television series, and first two episodes of the fourth season of the series. <P1-S1>  First aired on September 12, 1975, the series' first 60 minute episode (double the normal time) was most notable for its off-screen departure of the character of Captain Trapper John McIntyre (played by Wayne Rogers), and his replacement by the freshly drafted Captain B.J. Hunnicutt (played by Mike Farrell). <SEP> <P2-S0> "Paradise Island Lost" is the name to two-part story arc written by Phil Jimenez who also did the artwork, featured in "Wonder Woman (Vol. <P2-S1>  2)" #168-169. <P2-S2>  This was Jimenez' second story arc under his run on Wonder Woman, with the first being the "Gods of Gotham" four-issue story arc from "Wonder Woman (Vol. <P2-S3>  2)" #164-167. <P2-S4>  Just like "Gods of Gotham" where he was a co-writer with J. M. DeMatteis, he co-wrote this story arc with George Pérez, best known to have rebooted Wonder Woman in 1987 first with the "Gods and Mortals" story arc, that marked his return to the book since 1992. <P2-S5>  It wouldn't be until issue #171 where Jimenez became the book's sole writer. <P2-S6>  The story's name is taken from an epic poem of the same name by John Milton. <SEP> <P3-S0> "Villain of the week" (or, depending on genre, "monster of the week", "freak of the week" or "alien of the week") is an antagonist that only appears on one episode of a work of fiction. <P3-S1>  A villain of the week is commonly seen in American and Japanese genre-based television series. <P3-S2>  As many shows of this type air episodes weekly at a rate of ten to twenty new episodes per year, there is often a new antagonist in the plot of each week's episode. <P3-S3>  The main characters usually confront and vanquish these characters, often leaving them never to be seen again (as in "Charmed", "Smallville" and "Scooby-Doo"). <P3-S4>  Some series alternate between using such antagonists and furthering the series' ongoing plotlines (as in "Buffy the Vampire Slayer", "Supernatural", "Fringe" and "The X-Files", where fandom is often divided over preference for one type of episode versus the other), while others use these one-time foes as pawns of the recurring adversaries (as in "Kamen Rider", "Sailor Moon", "Super Sentai" and their American equivalent, "Power Rangers"). <P3-S5>  On other occasions, these villains return reformed, becoming invaluable allies or gaining a larger role in the story. <P3-S6>  The American action drama "Burn Notice" focuses on short-lived antagonists, but the final portion of every episode is committed to developing a larger story arc. <P3-S7>  The British sci-fi programme "Torchwood" used this format in its first two series, before switching to a continuous story format.