Ancient Aliens Season Episode
Ancient Aliens Season Episode 12,13,14,15,16,17,18,19,20 they not available to buy.
The History Channel, as rights holder, can make the choice of which seasons they want to sell through the Apple content Store. There isn’t anything that a reseller (Apple) can change about that.
Please choose a subscription based content provider that carries those seasons that are unavailable to buy. You may also try to contact the rights holder for more availability (Insta|X|FB|site contact).