'robot and his pals walking down a desert road together.'
is it made of yellow bricks with little people singing on either side?
Are the companions a scarecrow, a little girl and a lion?
Are they going to see a wizard of emerald city?
I'm getting ahead of myself... very good story though.
A good finish could be where the robot discovers he has a heart (KIDDING)
Maybe he could take part in a huge fight sequence where he rescues his friends but dies is the process.
His act was selfless.
Even though he is a robot, he has personality, which is what makes a human, human. He has achieved his goal... the end.
I dunno, though...