Bea and Victor walk from an indoor nighttime scene to rather obvious daylight. Victor walks away for a moment, giving catwoman Anita time to pounce on and attack Bea. A few moments later and from her room, Nina sees Anita prowling on the roof. Nina rushes upstairs to try to help her but Anita falls, proving that even though she had a cat brain, she still only had one life.
Upset Nina walks down into the lab, which I guess no one is bothering to keep secret anymore. She informs everyone that Anita is dead, then angrily tells the old bag and Victor to scram, which they do. Bea lies unconscious on a gurney, where we learn she lost an eye in her tussle with Anita. Dr. Frank tries to console Nina and tells her he hopes to save her eye as it's being preserved in some electrical contraption. Oddly, the doctor didn't turn on the machine until he started talking about it, so I'm not putting too much faith in that eye's freshness.
Dr. Frank tells Nina "Bea is a very lucky girl, you think that ironical?" Well Doc, if you consider being kidnapped, getting an eye gouged out then being treated by a guy who inserts animal brains in healthy people as lucky, then I suppose you could also consider it ironical. The Doctor defends himself against Nina's suspicions by stating he was shunned by the medical community and is now forced to continue his research by working for rich old fools. Bea wakes up screaming in pain and the doctor injects her with a painkiller. Between the eye-saving machine he forgot to turn on and forgetting to sufficiently sedate his patient, I'm starting to see why the medical community actually shunned Dr. Frank; I wouldn't trust him to measure my height!
Victor and old bag Mrs. March return from a shopping trip, in which they've bought fancy clothes for Nina and have also scheduled a beauty appointment for her, so now it looks like Nina is going to serve as Mrs. March's new body. In the lab, Nina tells Bea she's still going to try to figure out a way to escape. Perhaps she could use Bea's early sixties-style bra to chip through the walls; it looks like the woman is smuggling party hats under her shirt.
That night, Mrs. March views Nina as she tries on the fancy dresses and jewelry bought for her. The narrator shows up uninvited once more, to remind us how badly he needs a woman as he describes Nina: "So firm… so nicely rounded in places men like." I'd have just said that Nina looks attractive, not being a guy who wears his boner on his sleeve. Equally sleazy Victor (who is not the narrator, I assure you) walks in to ogle Nina. Mrs. March tells him to go away and implies that once her brain's in Nina's body, she won't be keen on keeping his old horny ass around. Angered, Victor nearly blurts out the whole plan in front of Nina but leaves instead.
That night, Victor gets drunk and reveals the whole plan to Nina anyway. Mrs. March will take over Nina's body, there will be a fire with 'Nina' as the sole survivor and she'll inherit the old lady's fortune while the real Nina dies in the old hag's body. I suppose no cops would be suspicious of arson or of Nina suddenly being named Mrs. March's beneficiary the same day she kacks, but that's another movie (oh, HELL no!). Victor agrees to help Nina to double-cross Mrs. March and avoid her fate, as long as he gets a share of the inheritance money.
Nina leaves then Mrs. March shows up and stabs Victor in the neck, killing him. Nina returns, screams and gets chloroformed by Dr. Frank as the operation is going to be performed immediately. Both women lay on gurneys. Mrs. March moans to Dr. Frank that all her life, "… any attention I received was not for me but for my money!" If its any consolation, lady, you also have a shit personality so your lucky when anyone gave you the time of day at all. The Doc puts both women under and gets to work once again on his flashing dry ice machine.
After the operation Nina wakes up to find that she is still herself. Unsurprisingly, it turns out the Doctor decided to take revenge on mean old Mrs. March, by putting her mind into the cat's body. He thinks it "… poetic to think of Mrs. March scavenging back alley garbage cans for her dinner", if not for movie scripts like this one. He tells Nina, still strapped to a gurney, that she is now wealthy and can keep all the money and live in this big dreary house as long as she allows the Doctor to stay and continue his noisy dry-ice shows in the basement.
While Nina ponders, he walks into his cyclotron chamber like an idiot, which gives Mrs. March, now a cat, the opportunity to jump onto the control panel and switch the chamber on, turning him into a skeleton. Mrs. March also flips the dumb 'so easy a cat's little paw can flick it' self-destruct switch, which starts blowing everything in the house up; it must've been a bitch installing that system, wiring explosives in every little space of the old house. Luckily, one-eyed Bea wakes up, bangs her face into a low-hanging light, realizes she still has a good eye, takes off her bandage and frees Nina. Then Bea decides a one-eyed life isn't worth living and takes a header into some electrical machine that kills her instantly. Once again we're reminded that a safe workplace wasn't a priority of Dr. Frank's.
Nina is able to make her way out of the house, followed by Mrs. March the cat. I'm not sure what happened to Hans the monstrosity; maybe he returned to the East German women's swim team. Who cares... at this point of such a film, like Nina I'm not going to retrace my steps. As we see the cat, our narrator, having had a cold shower, states "Mrs. March did not intend to let her money get out of sight… she would follow that girl… sometime, someplace, revenge would come!" What revenge, exactly? Revenge on Nina for keeping herself alive? Anyway, I feel confident that Nina will be okay in the future, you know how hard it is for a cat to keep running in the same direction, not to mention the constant butt-licking breaks.
Strangely (or maybe not so strangely), the four young actresses in this film (the three applicants plus the zombie girl) never made another film or television appearance after this one. Granted, two of them never really acted in anything else, but Erika Peters (Nina) was a fairly decent and attractive actress, so I assume she wanted to raise a family and/or get involved in another career, as I'm sure a film like this one, shot in ten days, couldn't have paid much. Director Joe Mascelli had a rather notable career for someone in charge of junk like this: he wrote what is considered a classic manual on cinematography a couple of years after this film, and, having worked for the US Army, was also known for being the cameraman for the first H-bomb test on Bikini Island. The writers involved in this film, however, weren't noted for anything worthwhile, as you might expect.