It is very nice to see the Tom Baker introduction and outtakes on there from the old 1997 "Beyond Belief!" VHS tape. I'm quite nostalgic about that purely because the films in that series, Berserk!,
The Mutations (which Tom Baker also stars in, which made his introduction all the better!) and the otherwise relatively unmemorable brain-transplant film
The Immortalizer (though these days it is amusing to see it as kind of the cruder version of Get Out!), were some of the first (non-anime) films that I bought during my early months of buying films by mail order!
Berserk! itself is quite interesting. It gets glaringly left out of the British horror period from that recent Feud: Bette and Joan mini-series to get to Crawford's more notorious British horror film for Herman Cohen Productions that followed this, 1970's
Trog, quicker (which makes it seem that Crawford is dealing with going to the UK for the first time as well as having to act in a really silly horror film, which is not quite correct when you know that she worked in the UK for the same producer on an earlier, more successful horror film three years before!), but its quite fun in its own right and makes for a good double bill with the other UK circus murder film from the 1960s,
Circus of Fear ("Fear...Fear...Fear...Fear..."). Berserk! itself had an early working title of Circus of Blood, but perhaps that was considered too close to the title of the film released just a year prior to stay unchanged. Plus of course Berserk! sounds closer in spirit to Psycho, Homicidal, Strait-Jacket et al!