This triple DVD box set of the entire season 4 can be purchased from Tesco for £16.97, which is a saving of £8.02, as the original retail price was £24.99, so you can get this for a good bargain! The front of the set is easily recognisable which a bright scene of all the characters in show outfits. The DVD's come in their own individual slim line boxes and on the back of each box is a summary if the 4 or 5 episodes you can choose to view!
Just to recap the main characters:
Peter Griffin- He's the 'family guy' and he's the insane and somewhat crazy head of the family who gives the series some of the most hilarious moments.
Lois- The poor nasal stay-at-home Mum who puts up with an insane household but secretly yearns for a bit of excitement in her life.
Chris- Voiced by Seth Green from Austin Powers, his voice alone makes me want to chuckle. Tormented by the evil monkey in his closet, Chris is somewhat slow, but means well!
Meg- the black sheep of the family, the rest of her family doesn't like her very much and she has all the typical teenage girl issues in her life, plus a few more!
Stewie- this one-year-old British-accent speaking evil genius baby has got to be my favourite character! He is intent on world-domination and destroying Lois, but he never seems to have any success!
Brian- the family's voice of reason (literally, because he can talk and is nothing like the dim and slow Peter and Chris) who helps them out through thick and thin; he considers himself a highly sophisticated dog- well he must be, drinking all those martinis!

The humour in the episodes is just perfectly done, with the right element of shock, which makes you laugh instead of getting offended. An example would be in the episode 'Petarded' where Peter learns he's mentally retarded and uses it as an excuse to do whatever he wants, such as kicking open the doors of all the ladies rooms and answers every outraged scream with a 'sorry-retarded-don't know any better!'
Though one of the best jokes in the episodes, which just personifies Peter and shows just how dumb he is… In the Episode 'The Cleveland-Loretta Quagmire', the whole gang are on a yacht playing Charades and their friend Joe who's in a wheelchair due to being paralysed-falls overboard. He obviously starts drowning and Peter shouts 'Joe! Kick with your legs!' Lois reminds him 'Peter he's a paraplegic!' to which he replies 'doesn't mean he can't hear!' You have to watch it in the context to really appreciate it, but I think that shows the genius writing of the producers and writers in that they know where and how to insert a joke so that you're not expecting it, but will still make you laugh!