They are accompanied by Zoe , who stows away as the time vessel departs .
With the invasion repelled , the Doctor and Jamie return to the Silver Carrier with the mercury they need to repair the TARDIS .
Silver Carrier are accompanied by Zoe , who stows away as the time vessel departs .
With the invasion repelled , the Doctor and Jamie return to the Silver Carrier with the mercury they need to repair the TARDIS .