In which TV series is Michael Kelso a main character?

In which TV series is Charlotte York a main character? Who played Eric Forman in 'That '70s Show'? In which TV series is Eric Forman a main character? Who played Michael Kelso in 'That '70s Show'? Who played Jackie Burkhart in 'That '70s Show'? In which TV series is Jackie Burkhart a main character? Who played Steven Hyde in 'That '70s Show'? In which TV series is Steven Hyde a main character?