Boris Karloff was a great actor, responsible for some of the most iconic performances in the horror genre and most effective in roles that showed menacing and sympathetic sides to his character's personality. Sadly, he was also an actor whose last few films didn't do justice to him or his career. The Incredible Invasion(or Alien Terror) is his last and while it is marginally better than House of Evil and especially Fear Chamber that's not saying much as it is still a mess, if there was a word that this movie is not it's incredible. Karloff of course is the best and only good thing about it, that the role is bigger here already makes it better than House of Evil and Fear Chamber and he performs with class and dignity, which is more than The Incredible Invasion deserved. Apart from Karloff the acting is just amateurish, Yerye Beirute brings unintentional humour in how bad especially he is. The Incredible Invasion is cheap-looking too, you get the feeling from the editing and photography that the movie was done in a matter of days(it mayn't have been but it honestly looks like it) while the sets are tacky and don't exude any atmosphere at all. The music is shrill and strident, while the dialogue sounds incredibly stilted and to even describe the direction is inept is insulting. The story has a cobbled together feel with no thrills, tension, scares or suspense despite having the elements that had the potential to make it so. Instead it was dull, often incoherent, thinly structured and far too strange for its own good. All in all, just a mess. Boris Karloff had a great career, but The Incredible Invasion was a very sad end to it, easily one of the absolute worst final films of any actor. 2/10 Bethany Cox

I don't know what it is about this one actor, but Yerye Beirute ROCKS. Not because he was a good actor (he was OK) but because you can make so much fun about his character in FEAR CHAMBER/THE TORTURE ZONE (Roland) and in THE INCREDIBLE INVASION/ALIEN TERROR (Thomas). They are both so over the top you have to make fun about them.I had a pretty good time with this film. Taking it for what it is, this film is very enjoyable. Enjoy it with some good friends and have some beer and you will find yourself having a wonderful time. The hardly makes any sense, the dialogues are beyond bad, ... It's a very special kind of a stupid film and very enjoyable as well.There's some kind of an anti-nuclear message in it, but it's a very forgettable one.

It has poor lighting, poor sound(as everyone except Karloff is dubbed, and on one occasion even he is dubbed, by someone doing a very bad impression. The editing is bad, although this may be down to a poor quality hacked up print, but in general it looks like a cheap film with Karloff's stuff looking like it could all have been shot in a couple of days. There are some classic funny bits, unintentional. I don't know why but I find a woman (possessed by an alien) slapping a man till he just punches her and knocks her out quite funny. *slap slap slap* *thwack* man wins. The plot was not that unusual but it was quite hard to follow what was going on even if you were paying attention. Karloff had a cool voice. 2/10 - Maybe slightly watchable for occasional funny bits.

Boris Karloff helped the producer and director put this film on the screen. Boris dispite his illnesses and inability to walk around, made this film a classic for all Karloff fans. "Alien Terror" or "The Incredible Invasion" should never have been made, very poor acting with the exception of Karloff, poor photography and sound. It is sad that this film was the last feature film Karloff ever made.