If you've redeemed the card into your account then you should be able to buy items where you use that account - so your iPod or computer's iTunes
Redeeming a card : http://support.apple.com/kb/HT1574
TV programmes can't be redownloaded in all countries (and even where they can be there is no guarantee that they will remain in a country's store for future redownloading) so it may be easier to do it on your computer's iTunes and then sync them (and so that you can take a backup)