What Could Have Been: Despite various hints of a possible crossover between the Sun Vulcan and Denziman teams (including Queen Hedrian outright mentioning Denziman in an early episode), no such thing actually happens in the series. There was even a publicity still of both teams posing in costume that was published in magazines when the series was still airing.
Before Haim Saban showed interest in Bioman, Stan "The Man" Lee wanted to bring Sun Vulcan over to Western audiences (Marvel held the copyright to this series despite not being involved with much). He even suggested adapting the series by using American actors for the out-of-suit scenes and stock footage for the transformed fights, just like Power Rangers eventually would. One of the networks it was pitched to was HBO (which at the time didn't have much in the way of original programming). See◊ here◊.