Pretty good movie. The anti-cat crowd loves it.
Return Of The Fly (1959) Full Horror Movie | Vincent Price
https://www.youtube.com/watch?v=J2gsf2uV0Qo
Curse Of The Fly (1965) Full Horror Movie | Brian Donlevy
https://www.youtube.com/watch?v=sXbnWfl_JiI
I couldn’t find a free version of the first one in the series (The Fly).