Daleks, scourge of the galaxy and would be
masters of the universe. The trouble is the buggers don't have legs.
Daleks travel round in pepper shakers with big phallic guns sticking out the front.
Because they move on rollers they can't move in three dimensions.
In one episode, the Doctor escaped the Daleks by climbing up a rope. As he climbed he taunted his pursuers with the line:
"If you're so clever why don't you climb after me!"
Or something like that.