User blog comment:AttackEyebrows12/Epic Rap Battles of the Whoniverse 4: The Celestial Toymaker vs Kandyman/@comment-4872155-20151010154827

Dalek vs R2-D2 (bad robot vs good robot)

Davros vs Hitler (both want to wipe out an entire race)

Cyberman vs RoboCop (both men in robot suits)