The Chrononatrix

""OMIGOD! You're some sort of... Temponatrix... a Timey-whimeynatrix... A CHRONONATRIX!" "Yes! I like that.""

- Doctor Donna vs. The Chrononatrix

The Chrononatrix, true name Malshina, is an enigmatic Renegade Time Lord and archenemy of the Doctor Donna.

First incarnation
The first known incarnation of the Chrononatrix was encountered by the Doctor Donna at a later point.