Editing Kevin McMahon (section)

== Throughout The Series ==
=== [[Season 2]] ===
Kevin is first shown to be a part of Big Alice's hospitality. He is resentful towards Melanie for leaving him to die in the freeze. He is responsible for allowing the trade of food and drugs between the door of the two trains without the consent of [[Joseph Wilford]]. This leads to a surprise attack led by Layton who breaks through the door as Kevin allows for the door to be opened to trade. As a result of this, he is tied up and dragged down into Snowpiercer to be taken prisoner.

He is later interrogated by Layton and Roche where at first he refuses to answer any questions. Under the belief that Mr. Wilford would want him back. With the food situation on Big Alice seemingly not as quality and plentiful as it is on Snowpiercer, he quickly gives in after being bribed with buffalo style chicken wings where he gives important information on Big Alice.

There is later a prisoner exchange where for Melanie, Kevin is returned to Big Alice. Mr. Wilford presents himself as welcoming and happy to see him, he continues this by offering Kevin a bath. However Wilford questions Kevin about his time on Snowpiercer, Kevin's voice becomes shakier as he is further questioned. Kevin lies about revealing information but admits to eating the chicken, Mr. Wilford changes attitude and Kevin is exposed for dealing the mangos and fruit whilst the others on Big Alice were hungry. And as a result, being responsible for the earlier Snowpiercer attack by letting the door be opened.

Mr. Wilford hands him a razor and Kevin acknowledges what Wilford wants him to do. He is reluctant but slits his wrist with it and bleeds in the bathtub under Mr. Wilford's watch.

After the incident, Mr. Wilford says that Kevin has fallen ill when Layton asks him about him.

Later, Kevin was shown to be alive in Big Alice, strapped to a chair and suffering extreme emotional distress over his experience in the tub.

===[[Season 3]]===
In ''[[The First Blow]]'', Kevin and the [[Jackboots]] capture several revolutionaries, including [[Strong Boy]] and [[Z-Wreck]]. Strong Boy volunteers to be tortured in order to protect his friends, but he refuses to break under Kevin's torture and give up his comrades. Kevin freezes and smashes off Strong Boy's fingers and sprays cold air into his mouth in order to remove his tongue. Strong Boy eventually dies from Kevin's torture of him.

After Wilford is forced to surrender, Kevin is left in disbelief that it's over. Knowing that [[Andre Layton]] won't take what Kevin did well or that she and [[John Osweiller|Oz]] stood by and did nothing, [[LJ Folger]] kills Kevin for his actions by stabbing him in the neck so that she will be considered to have been on Layton's side of the revolution.