Human-Time Lord Meta-Crisis

A Human-Time Lord Meta-Crisis has only ever existed once, "The DoctorDonna". The human brain cannot hold a Time Lord Consciousness so the Doctor had to erase Donna's mind. (DW: Journey's End) It is arguable that Rose has the same thing done to her but as it was only the TARDIS/Time Vortex the Doctor only had to erase the vortex from her head. (DW: The Parting of the Ways)