This one was harder than it needed to be...
The head and hands are the JAKKS wrestler and the rest is the ToyBiz. Sorry I forgot their names. Anyway, the wrists and head are rare earth magnet-ed on, after I tried wood dowels that didn't work. I had to swap the forearms after I glued the magnets in with reverse polarity for the right wrist! Anyway, then just paint and the cage chain out of epoxy and bam!