Chronal wave

A chronal wave was a time-altering force that was created whenever anyone attempted to operate the SKARDIS. This is because it was an imperfect version of a TARDIS, created from knowledge stolen by the Skith from the Tenth Doctor. Some of the effects of the SKARDIS' use in 21st century Sydney Australia included: aging a group of humans, bringing mammoths and dinosaurs from the past, and freezing Sydney Harbor Bridge. The SKARDIS was destroyed by UNIT, and the Doctor helped alleviate the effects of the chronal damage. (COMIC: The Age of Ice)