We're excited to once again be joined by director Ralph Senensky for our deep dive of "Obsession," the 4th episode of "Star Trek" he directed for The Original Series.

After a malevolent force claims the lives of three crewmen, Captain Kirk is convinced that the culprit is the same deadly force that killed 200 crew members from the USS Farragut on his watch as a young lieutenant 11 years before. Among those killed were Kirk's commanding officer, the young son of whom is now serving as an ensign aboard the Enterprise. Driven by guilt and a lust for vengeance, Kirk puts his career on the line and his crew in harm's way in an effort to hunt down and destroy this gaseous creature once and for all before it continues its killer reign of terror across the galaxy. Like "The Doomsday Machine" before it, "Obsession" is another take on "Moby Dick" in space, but this time Kirk is Ahab, and the whale is the gaseous cloud creature from Kirk's past. On every level, "Obsession" holds up as a taut, tense and exciting "Star Trek" classic, and it further deepens the dynamic between Kirk, Spock and McCoy while also featuring superb performances by William Shatner and guest star Stephen Brooks.

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