I'd love another male companion! Heh Sylvester McCoy didn't really seem to consider that when he was complaining about how a female Doctor would ruin the dynamic between the Doctor and his assistant!


Spoilers for Missy and DW:

And Missy is the Doctor's long-standing enemy, the Master. He always appeared as male in the past, so it was a twist in series 8 when a villain known as Missy was eventually revealed to be short for Mistress, aka The Master