Case File Three, subtitled Krasko, was released online in 2018, alongside Rosa.
Yaz gives a report on the racist mass murderer Krasko. Krasko had been imprisoned at Stormcage in the far future for the murders of over 2000 people. Upon his release, he was given a neural restrictor to keep him from ever killing again. However, Krasko found a way around this by making use of a temporal displacement weapon; as he would not be causing harm, the implant could not stop his actions.
Krasko, being a racist towards people of African descent, believed that the Civil Rights Movement was sparked by Rosa Parks' arrest. He went back in time to disrupt either the bus routes or find ways to delay her; his temporal displacement weapon was a last resort if all his tricks failed
However, thanks to the Doctor and her companions, Krasko was hit by his own device and sent somewhere far in the past. Yaz notes that this was a fitting fate for Krasko as his racism "belonged with the dinosaurs."
- Krasko was a mass murderer from the future who killed 2000 people.
- Krasko was a racist with "serious anger issues".
- Krasko beared a Stormcage identifier, having been imprisoned at Stormcage, a "big space prison".
- Krasko used a vortex manipulator as a time travel device.
- Krasko was released from prison before travelling back in time to 1955, where he intended to change the past.
- The Sahara Springs Motel is seen.
- Krasko arrived in Alabama with future technology including an information brick, a multi-intercept and surveillance device as well as a temporal displacement weapon.
- The temporal displacement weapon used artron molecules to shoot pulse bolts that could displace objects or people in time. The weapon overheated easily.
- Krasko was prevented from directly harming people due to a neural restrictor in his brain.
- Krasko targetted Rosa Parks, a civil rights activist and hero whose brave actions kickstarted the Civil Rights Movement.
- Ryan Sinclair displaced Krasko in time.
- Yaz says Krasko's attitude belongs with the dinosaurs.
- Case File Three uses imagery from the television story Rosa.