So,
Maria and Luke go to the new school. Luke is of course the boy from the first episode Sarah Jane adopted. Luke is totally clueless. Clyde is a boy from school, who is interessted in Maria, but Luke is part of it.  Clyde found Luke special.

Luke feels like he don’t fit into all that. He don’t like school and want to stay at home. This is a problem many people have. He don’t fit in and that is a real society problem. I like Clyde but people like him make it for many people really difficult. But also he is totally interessted in him. He tried to talk with him, but Luke is just special. He doesn’t know anything about society. He has to learn all these things.

Science problems are interessting for him so. His first action on school is to give the Slitheen the solution for there problem.

Clyde  found about the aliens and handle it pretty well. Also he is actually pretty good at seeing the little things.

Sarah Jane did something we know from the Doctor, give them a chance to turn away.

In this episode you see why it is so much deeper than a few Doctor Who epiosdes. The Slitheen has a child with them. At the end they are trapped in the door and will die. The father is begging for his sons live and Sarah Jane wanted to save them. When Clyde was happy that the win, she is saying that it was a child. That is the amazing thing about Sarah Jane Smith.