Nigel Davies's Scarlets will be hoping to bounce back from opening defeats in the Heineken Cup.
The Scarlets have brought back their big guns for their trip to Ulster in a last ditch attempt to keep their European Cup hopes alive.
Nigel Davies's side are currently languishing in third place in Pool 4 after a home defeat to Harlequins and a hefty loss at Stade Francais. If the Scarlets stand any hope of making the knockout stages - and that's a faint one at best - they must gain maximum points at Ravenhill to kick start their campaign.
"Friday's game is a massive one for us. We're not where we want to be in Europe at this stage but I don't think it's completely over for us," explained Davies.
"If we can go to Belfast and get a result then that puts us in a position where we can look forward to two back-to-back home games.
"So, if we get a result in Belfast, then who knows? There's no doubt we've got to put in a big performance on Friday; we're a very proud team and we're not going to hide from putting in that performance. We'll fight all the way."
His squad includes four Wales players fresh from beating Australia at the Millennium Stadium - Dafydd Jones, Mark Jones, Stephen Jones and Matthew Rees. Also back in the fold is new Wales scrum-half Martin Roberts and Wales full-back Morgan Stoddart.
Davies said: "It's great to have them back. They've returned buoyed by last weekend's success and they're our most experienced, talented players so to have them all back in the group is brilliant. They've added a lot to everything we've done this week."
Scarlets long-term injuries include Kees Meeuws, Gavin Thomas and Rob Higgitt, with shorter-term difficulties for stars such as Gavin Evans, Simon Maling and Darren Daniel.
Scott MacLeod was not considered for this weekend as he works to overcome a recent long lay-off.
Davies said: "We've not got much fully fit cover behind the scrum at the moment but we've still been able to put out a very team."
Scarlets: 15 Morgan Stoddart. 14 Ceiron Thomas, 13 Regan King, 12 Jonathan Davies, 11 Mark Jones, 10 Stephen Jones, 9 Martin Roberts: 1 Iestyn Thomas, 2 Matthew Rees, 3 Deacon Manu, 4 Vernon Cooper, 5 Dominic Day, 6 Dafydd Jones, 7 Simon Easterby (capt), 8 David Lyons
Replacements - 16 Ken Owens, 17 Phil John, 18 Nathan Thomas, 19 Johnathan Edwards, 20 Gavin Cattle, 21 Rhys Priestland, 22 Lee Williams.
As the countdown continues for RWC2015, Tournament Chief Executive Debbie Jevans visited the Millennium Stadium to discuss preparations for the eight matches and reveal the positive news that 100,000 tickets for games at the home of Welsh rugby have sold in the last seven days.
Jason Harries is targeting a first win on the World Series circuit this season with Wales. The series returns to action this weekend in Dubai where Harries is part of a team hoping to build from its efforts in round one in October.
Wales skipper Jevon Groves says his side have addressed a few points from Gold Coast and aim to 'hit the ground running' in the next two rounds of the World Series, kicking off with this weekend in Dubai before heading off to South Africa next week.
Wales Sevens manager Steff Thomas is hopeful his side can build from a quarter-final spot in the opening round of the World Series in Australia when his side take part in the forthcoming double header in Dubai and South Africa.