I don't know how I would complete this, but let's see how GPT-2 would:

1970s — Star Wars
1966 — Superman
1966 — Superman
1966 — Star Wars
1966 — Star Wars
1966 — Superman
1966 — Superman
1966 — Batman
1966 — Superman
1966 — Superman
1966 — Superman
1966 — Superman
1966 — Batman
1966 — Superman
1966 — Batman
1966 — Batman
1966 — Superman
1966 — Batman
1966 — Batman
1966 — Batman
1966 — Batman
1966 — Batman
1966 — Batman
1966 — Batman

...not what I expected, really. Maybe GPT-3 would do better, but come on, I don't want to join the private beta just for this.