As a full-time companion.
I, for one, am SO FUCKING EXCITED.
You should be excited, too. If you're not, then...okay, don't be. But don't sign petitions against her, because it makes me SO EXCITED to hear she's coming back. It also makes my current Donna/Ten ficlets canon.
For the next 175 days I will be writing ficlets with Donna as companion, Martha as companion, Rose as companion and Frobisher as companion and they will all be separate and canonical. Why Frobisher? Cause I can! And...cause if a CG penguin wasn't so expensive, you know he'd be there! Right there! Being all...Frobisherly!
Also, I'm in need of a Frobisher-and-Ten icon. Someone make this happen.