TV Mania, Cooneen, Zeon and Gemma International added to licensing drive by WBCP.
A total of nine companies are now on board for the new look Thundercats, with Warner Bros Consumer Products confirming apparel and stationery partners for the property.
TV Mania (children's apparel), Cooneen (nightwear and underwear), Zeon (watches, bags and gifts) and Gemma International (paper party wear, greeting cards and gift wrap) have all joined the licensing programme.
The four newcomers join master toy partner Bandai, plus MV Sports, Rubies, Character World and Panini.
Bandai's toy line is due to launch in the UK in time for Christmas.
The new Thundercats animated series will hit UK TV screens in Q3, launching exclusively on Cartoon Network in August.
"The fact that we've signed nine licensing deals before the new Thundercats TV series has even been broadcast is a great indication of our partners' faith in the potential of the franchise," said Paul Bufton, general manager, WBCP UK. "We're confident that Thundercats is on track to re-emerge as the UK's hottest boys brand."