4400 centers on the return of 4400 people who, previously presumed dead or reported missing, reappear on Earth. Though they have not aged physically, some of them seem to have deeper alterations ranging from superhuman strength to an unexplained healing touch. A government agency is formed to track the 4400 people after one of them commits a murder.
When her life comes to an abrupt end, George discovers that death is nothing like she thought it would be. Recruited to collect the souls of others as they die, she suddenly finds herself an unwilling participant in a line of work she never knew existed: Grim Reaping!
An amphibious shark-like monster attacks an abandoned secret military base and the people who live on the island.
