no doubt not the best from director jack arnold and but very watchable . a college professor ( arthur franz ) nick his hand on the teeth of a prehistoric fish and turn into a murderous man or beast . part of this movie can be very chilling and then a few moment later you want to shout that pretty funny . watch this in tandem with one of arnold better flick tarantula and you will have a fun and thrill evening . franz give a great performance compare to the rest of the cast that include represent joanna moore and nancy walter and whit bissell and pretty boy troy donahue .