Ducky (David McCallum) will be forced to relive one of the most traumatic moments of his youth in the upcoming episode of the long-running CBS series "NCIS."

In "Spinning Wheel," CarterMatt reports that the death of his half brother years ago has haunted the medical examiner extraordinaire for the longest time. Then a man who claims he knows classified information about the murder surfaces. Ducky enlists the assistance of the NCIS squad to investigate and capture the true culprit. On the course of the probe, he cannot help but look back on the emotional turmoil he underwent during the last days he spent with his sibling.

Meanwhile, Bishop (Emily Wickersham) and Jake (Jamie Bamber) will take time to discuss their marriage. After a much needed break during Thanksgiving, the agent is back and she wants to settle things with her unfaithful husband. Jake admitted to having an affair and Bishop is hurting. Although she refused to communicate with him when she was back home in Oklahoma, this time, she is willing to open her doors. Will they be able to save their marriage?

Last episode, the team helped an ailing sailor, who is suffering from leukemia, to find a bone marrow donor. Navy Lt. Alex Quinn's (Jack Mikesell) two siblings were both killed in active duty in the past year. Hoping to help the family from further heartache, the Secretary of Defense asked the NCIS to step in and find a donor for the patient. His remaining brother has been missing and authorities suspected he was involved in a counterfeit syndicate.

When they eventually found him, tests showed he was not a viable donor. Bishop then came across the record of a former soldier in the military database. He was a perfect match for Quinn. Unfortunately, the man had grown embitter with the force after being sent to prison for killing two Iraqi detainees. He did not want to help but Bishop and Gibbs (Mark Harmon) were able to convince him in the end. Quinn had his transplant while his mother and surviving brother stayed by his side.

"NCIS" airs Tuesdays at 8 p.m. EST on CBS