 In the aftermath of the battle with their future selves, the crew, resurrected from the dead, due to time paradox s and Lister is depressed when he learns the curry supplies were destroyed in the battle. But all hell breaks loose yet again, when Lister uses Kryten s spare-head "Spare Head 2" to take them back into time to get some curries from Earth. Only to change the assassination of President John F. Kennedy and create a alternate dimension.