Both bands will perform on Friday 4th December.
Following their 11th hour addition to the Sunday afternoon line-up last year (filling in for Vandenberg's MoonKings), AOR legends FM will once again play Planet Rockstock; this time headlining the main stage on the Friday night!
Also set to rock the main stage on the Friday are The Dead Daisies, whose rotating line-up of rockstars will be fresh from touring with Kiss and Whitesnake.
Over on the second stage, three more new bands have been added to the bill: Cairo Son, Raw Glory and City Of Thieves.
They'll all join Sunday night headliners The Darkness, as well as Joanne Shaw Taylor, Fozzy, Danko Jones, Heaven’s Basement, Dan Patlansky, John Coghlan's Quo, Scorpion Child, Crobot, Gun Metal Gray and more.
Tickets for Planet Rockstock 2015 are already selling fast, and there's still more bands (including the Saturday headliner) to be announced. Silver accommodation tickets have sold out, leaving only Gold (which includes an extra night on-site and an event t-shirt) and Bronze packages remaining.
The whole thing takes place at Trecco Bay, Porthcawl, South Wales from 4 - 6 December. To find out more and book your tickets, head to planetrock.com/rockstock now!
You can also help FM decide what songs will be in their set list! Simply e-mail firstname.lastname@example.org with what you want to hear them play.
You can see the line up so far below: