Sam Cooper

Sam Cooper is a member of Bryce's Group and a survivor of the apocalypse introduced in Season 2. At some point during the initial outbreak, Sam found her way to Bryce's Campsite and volunteered to go on runs for resources.

Pre-Apocalypse
Not much is known about Sam's life before the apocalypse, other than she went to school with Tim.

"Are We Okay?"
On a run to a fire-station for fuel, Sam, Pepper, Dexter, and Simon are trapped by infected, with Simon being bitten in an attempted escape. As Dexter tries to carry him out, he drops Simon and twists his ankle, leading to Simon being overrun by infected. Sam and Pepper then carry Dexter away, being saved by Blake and the others, who take them to the school.

Later, Sam laments that they have to tell Simon's brother, Clyde about his death. The next morning, she stays behind as the others go back to the campsite.

"What Have You Done?"
Sam notices that Maeve is talking to herself and attempts to ask her about it, to which she shrugs her off. Tim then tells her that Maeve has "been through a lot" and just needs time. Later, Tim tells her that the two of them went to the same school, to which Sam says she remembers, recalling that he dropped out with two older guys. Later that night, she and Tim sleep together.

"Gone Too Long"
The morning after, the school is attacked by Scavs, who Sam recognises and tries to warn the others, but is too late. After being saved by Blake, Pepper, and Claire, Sam helps what the Scavs are. Blake later leaves with Pepper to find Trevor and Phyllis Cotton, Sam is confronted by Charlie, who asks why they didn't tell them. The conversation almost becomes heated before Tim stops her and leads her away.

Pepper
Sam and Pepper do not interact much, but appear to be close. Pepper comforts her when Simon dies.

Dexter
Dexter and Sam seem to have a good relationship. She is visibly worried about Dexter's ankle and goes out of her way to help him when they are surrounded by infected.

Simon
Sam appeared to have a closer relationship with Simon than the others. She is more distraught by his death and wonders what they will tell his brother, Clyde.

Tim
Tim and Sam both went to school together, though their relationship during this period is not known fully. When they reunite during the apocalypse, they appear friendly to each other, where they discuss their past and eventually sleep together.

Killed Victims

 * Possibly numerous Scavs
 * Presumably numerous infected.

Trivia
To be added...