《疯狂原始人》是讲述一个原始人家庭冒险旅行的3D喜剧动画片。原始人咕噜一家六口在老爸Grug的庇护下生活。每天抢夺鸵鸟蛋为食，躲避野兽的追击，每晚听老爸叙述同一个故事，在山洞里过着一成不变的生活。大女儿EEP是一个和老爸性格截然相反的充满好奇心的女孩，她不满足一辈子留在这个小山洞里，一心想要追逐山洞外面的新奇世界。
没想到世界末日突然降临，山洞被毁，一家人被迫离开家园，展开一场全新的旅程。离开了居住了“一辈子”的山洞，展现在他们眼前的是一个崭新绚丽却又充满危险的新世界，到处都是食人的花草和叫不出名字的奇异鸟兽，一家人遇到了全所未有的危机。在旅途中，他们还遇到了游牧部落族人GUY，他有着超凡的创造力和革新思想，帮助咕噜一家躲过了重重困难，途中他还发明了很多“高科技”产品，并让他们知道了原来生活需要“用脑子”，走路需要“鞋子”等等。一行人在影片中展开了一场闹腾而又惊险的旅程。
疯狂原始人经典英语台词：
Guy: This is called a brain. I think that's where ideas go.
Thunk: Dad, I don't have a brain.
"Eep: My name's Eep and this is my family, the Croods. We never had the chance to explore the outside world because of my dad's one rule:
Eep: Never leave the cave.
Grug: New is always bad. Never not be afraid!
Eep: We never had a chance to explore the outside world, but what we didn't know was that our world was about to change."
"[Gran tries to eat Belt, the sloth, but Belt pulls a knife on Gran.]
Guy: Don't do that. He's not food. He's a pet, my pet.
Gran: What's a pet?
Guy: An animal you don't eat
Gran: We call those children.
Eep: [Smitten with Guy] Isn't this fun? We're taking our first trip together."
"Grug: Just think, our whole family packed together on a long, slow trip across country. We'll tell stories. We'll laugh. We'll become closer as a family.
[Sandy, the baby, bites Grug's face.]
Grug: Ah, get her off!
Ugga: If you're not ready to challenge her then don't look her in the eye!
Gran: Could you keep your big giant arms on your side of the trail?!
Grug: You want me to turn this family around? Do you? Because I will turn this family around so fast!
Thunk: Dad, I gotta go!
Grug: Come on, you can hold it.
Gran: I'm not dying on an empty stomach.
Ugga: Ugh, we're all pretty tired.
Grug: We'll eat when we get there.
Gran: It's taking too long! I'm grabbing a snack."
"Guy: We've gotta move faster. I call them shoes.
Eep: [screams] I love them! Where are my feet?"
"Eep: Oh, I've been in that cave forever!
Grug: Three days is not forever.
Eep: It is with this family.
Ugga: Mom, we're ready to leave. Mom?
Gran: Still alive!
Grug: It's still early."
"Grug: Ideas are for weaklings."
"Guy: Who are you.
Eep: OH! Eep.
Guy: Let me clarify Eep. The world is ending.
Eep: What
Guy: I am calling 'The End'"
"Guy: I am guy.
Eep: Guy.
Guy: And this is Belt.
Guy: Cook, conversationalist, navigator.
Guy: Also keeps my pants up.
Eep: What are pants up."
"Guy: Belt, emergency idea generator activate!"
"Grug: Never not be afraid."
"Thunk: You need a name, I think I'll call you Douglas. Roll over Douglas."
网友观后感：
1. 没有男人有不要捉急，只要你力气够大，身为女汉子你总有一天能给自己抓一只男盆友
2. 就让动画片拯救全人类吧!!
3. 尼古拉斯.凯奇 最近十年最好的作品。
4. 在最近弥漫着伤亡和仇恨的信息流中，《疯狂原始人》悄悄的在影院里释放着一抹治愈，这部充满惊喜的动画片可以让人短暂的忘记现实的不堪和不幸，这周不论是老美还是我们，都在在哀悼和愤懑，但这之后，都是还得继续生活啊。
5. 很有爱的一部片。先头有些闷，主要是穴居爸的封闭世界观弄得不舒服。。。随着一队人踏上征程，奇幻壮丽的动物世界实在是壮观，梦工厂的想象力无限美好。影片最感人的地方是穴居爸舍身将一家人扔过悬崖，叫他们去寻找光明。。。影片的主题就在这一幕当中自然的升华了。。。结局也是无限美好的，还加入了可爱的动物军团。