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I have also seen this and have been trying for ages to remember what it is! A bit of googling suggests it might be Robbie the Reindeer, specifically the second episode?
Hmmmm I don't think it was Robbie the Reindeer. I just looked through a couple episodes. I don't remember vikings and aliens, and I don't see the scene I remember.
There were some lines between the villain and her lackeys I vaguely remember like, "How will we reset this station?" "Oh, this station can't be reset. This is his final performance." *ominous music as reindeer is lowered slowly into vat of acid*
Okay so I cannot find anything about this online, but as a child I remember watching this movie (it might have been claymation) about reindeer, and they were trying to escape this villain, and the two main reindeer were in love, and the villain forced them to work as a tourist attraction as if they were animatronics, but the villain really hated the main character and decided to kill him off by lowering him into a vat of acid, and yeah. Anybody have any idea what this is?! Thanks.