A time-travelling device is also built within the laboratory. It was used by Kenny so that he could return to the past, in an effort to stop the COVID-19 pandemic, as well as to "stop the people who ruined the future" - namely his friends Stan, Kyle, and Cartman. Unfortunately, a technical problem occured during the sequence, killing all other scientists in the process. Kenny later returns, supposedly having contracted the virus.
In South Park: Post Covid: The Return of Covid, many of the boys' friends attempt to activate the machine so that they can travel back in time and stop the pandemic from happening. Cartman, on the other hand, decides to thwart their plan in order to protect his family, eventually succeeding with the help of Butters and having the machine moved to the South Park Church.