The first episode of Skins introduces viewers to a gang of friends through their leader, Tony.

Tony is good looking, intelligent and ambitious, and he plans to help his best mate, Sid, lose his virginity at posh Abigail's party, with the help of some illegal drugs. However, things don't go quite as planned...

Cassie's family and friends are too wrapped up in their own worlds to notice she is not eating and that her health is at risk. Will this change when Cassie gets to know Sid?

Jal has reached the finals of 'Young Musician of the Year', but do her family want her to succeed? Her untalented brothers won't let her practise and her father, who resents Jal's resemblance of her mother, seems more concerned about his younger pretty blonde girlfriend. Meanwhile, it looks like Sid is not out of trouble yet...

Pill-popping Chris wakes up to discover his mother has left home, but given him 1,000 to cover bills but he blows all the money on drugs and partying, before facing up to the fact that she may never return.

Sid is in trouble, deep trouble. His coursework hasn't made the grade, he's as sexually frustrated as ever, and he can't get his best mate's girlfriend, Michelle, out of his head!

A school trip to Russia provides plenty of opportunity for the testing of friendships, as Anwar's religion and Maxxie's sexuality collide.

A distraught Michelle breaks up with Tony after he fails to own up to cheating on her with Maxxie in Russia. Michelle also faces conflict at home, with her latest young step-dad. However, things start to look up when Michelle meets Josh, Abigail's brother. A jealous Tony is determined to sabotage the new relationship, but will Michelle take him back?

Things get dark this week as Tony's silent little sister, Effy, goes missing. Desperate to find Effy, can Tony rely on any of his old mates, or have they all shunned him forever?

In the series finale, it's Anwar's 17th birthday and his mother throws him a party, which would be okay if it wasn't for his disapproving father, embarrassing uncle and mocking sisters. However, the real trouble arrives when Anwar is finally forced to confront the division between his family's religion and his best friend Maxxie's sexuality. Meanwhile, Sid has finally sorted out his priorities and goes in search of Cassie. What he doesn't know though, is that Cassie is leaving that very same day for Scotland, and has resigned herself to saying goodbye. Will the two manage to find each other in time, or is this the end to their unstarted relationship?