Chronal wave

A chronal wave was a time-altering force that was created whenever anyone attempted to operate the SKARDIS. This is because the SKARDIS was an imperfect version of the Doctor's TARDIS, created from knowledge stolen by the Skith from the Tenth Doctor's mind.

The SKARDIS' use in 21st century Sydney Australia caused it to release a chronal wave each time the Skith tried to fly it. One chronal wave aged the crew and passengers of a plane it hit greatly, another froze Sydney in ice from the Ice Age, and others brought prehistoric creatures such as dinosaurs and mammoths into 21st century Sydney.

The SKARDIS was destroyed by UNIT, and the Doctor helped alleviate the effects of the chronal damage. (COMIC: The Age of Ice)