Name: Sarah Jane Smith
Played by: Elisabeth Sladen
Home Planet: Earth
Species: Human
First Appearance: Invasion of the Bane (2007)
More Information: Sarah Jane Smith is well acquainted with saving the world. An old friend and companion of the Doctor, Sarah Jane has travelled the universe, solving mysteries, tackling monsters and fighting alien foe all the way. Her travelling days may be behind her, but as a journalist with a nose for trouble, Sarah Jane often finds herself on amazing adventures closer to home. With the help of her adopted son, Luke, his best mate Clyde and their new neighbour Rani, along with her sonic lipstick, and the alien computer Mr Smith, she must defend Earth from extraterrestrial threats and monsters.

Name: Luke Smith
Played by: Tommy Knight
Home Planet: Earth
Species: Human
First Appearance: Invasion of the Bane (2007)
More Information: 14-year-old Luke Smith looks just like any other normal teenage boy, but look closer and you'll see that he's very, very special. Grown by the alien Bane as The Archetype in their plan for world domination, Luke has the brain power of 10,000 people but, as he's only really a year or so old, his understanding of the world around him is sometimes lacking. But he's a fast learner, and his intelligence often proves key in saving the day.

Name: Maria Jackson
Played by: Yasmin Paige
Home Planet: Earth
Species: Human
First Appearance: Invasion of the Bane (2007)
More Information: When Maria Jackson moved to Bannerman Road, her life changed forever. After a chance encounter with Sarah Jane Smith and a friendly visiting alien, Maria's eyes were opened to a whole new world of opportunity, mystery and adventure. A good friend to Sarah Jane, Maria often finds herself in sticky situations, but with the help and support of her friends Luke and Clyde, Dad Alan, and of course, Sarah Jane Smith, it's often the evil aliens and horrific monsters who threaten the earth that come unstuck.