: Mark finally reveals that his brain tumor has returned.

The episode features the core ensemble cast of the eighth season: Dr. Mark Greene Attending Physician Alex Kingston Dr. Elizabeth Corday Associate Chief of Surgery Laura Innes Dr. Kerry Weaver Chief of Emergency Medicine Noah Wyle Dr. John Carter Chief Resident Maura Tierney Abby Lockhart Goran Visnjic Dr. Luka Kovač Attending Physician Sherry Stringfield Dr. Susan Lewis Attending Physician File Format Information

The string refers to a video file for Season 8, Episode 17 of the long-running medical drama ER , titled " Bygones " . Episode Breakdown: " Bygones " Original Air Date : March 28, 2002 Director : Jessica Yu

: Dr. Corday suspects Mark is involved with Dr. Lewis, leading to awkward confrontations. Cast & Characters

: Two college students are rushed into surgery following a brutal knife attack on campus.