I suspect the Kromagg makeups in the episode were the work of Toby Lindala, who was based primarily in Vancouver as he worked on The X-Files. In fact, several X-Files Grey masks are actually seen in a display case in one scene of 'Invasion'!
Between the reused X-Files masks and the similarity the Kromagg makeups have to Lindala's alien makeups for The Outer Limits episode 'The Grell', I'm certain that Lindala (or at least a member of his studio) must have worked on this episode. Location filming for Sliders moved to Los Angeles after the second season completed, which resulted in a variety of makeup effects artists working on assorted episodes. Todd Masters supplied some makeups and puppets for a couple of episodes, such as the slug puppet in 'The Breeder'.However, certain episodes also required more advanced prosthetic makeups; according to Stephanie Fowler, who was the makeup department head, it was Michael Westmore and Ed
French - who were both providing the makeup effects for Star Trek: The Next Generation and its sequel series - who contributed these makeups.
Fowler specified that Westmore made the pieces but didn't work on-set, with Ed French applying it on-set. In an email to me, French recalled that he had worked on the episode 'State of the ART' (starring Robert Englund of Nightmare on Elm Street fame), supplying assorted light-up prosthetic pieces (the same sort put on Brent Spiner as Data on Next Generation?) The vampire-like makeups in 'The Last of Eden' must have been Westmore and French's work; sadly I haven't been able to find any behind the scenes photos of these makeups. The makeup design was applied on several performers in the episode. A lion-like facial appliance was made for Deron McBee as the lion mutant Ceres in 'This Slide of Paradise', and again I wish there was more behind the scenes photos of this makeup! The last two seasons had their special makeup effects supervised by Bernd J. Rantscheff, his team including Thomas Surprenant and James Rohland. Rantscheff's team redesigned the Kromaggs to be more human-like, now with heavy brows, noses and bald heads.(I also would like to thank Thomas Surprenant for kindly sending me the behind the scenes photos he took during his time on the series!)
Rantscheff's team also realized the cyborg Eddies in the episode 'California Reich', with a silvery facial prosthetic obscuring the performer's mouth, as well as a half-face makeup applied to Carol Huston as an incomplete Eddie.



















