Doctor Who Without The Doctor

The last two Doctor Who seasons each featured one episode where the Doctor hardly appeared. Looks like this year's "Doctor-lite" episode may take place inside his time machine, the TARDIS. (Though we liked the Doctor-Lite episode last year, which followed an ELO cover band in London full of Whovians.) How are they going to pull it off? Simple: strand the doctor somewhere so his companions Rose, Martha and Donna can have crazy adventures in time and space without him.