Gourmet Burger Kitchen will close 26 restaurants and axe 362 jobs after being bought by "Chicken King" Ranjit Boparan.
Boparan Restaurant Group's rescue of the chain out of administration follows its purchase of Carluccio's out of insolvency earlier in the pandemic.
GBK said it had started to see improvements in trading last year after a major restructuring process in 2018 that resulted in a raft of closures.
However, the company said it slid into administration after the virus affected its viability.
The group, which had been owned by South Africa's Famous Brands, has now been sold in a pre-pack administration deal after working with insolvency specialists at Deloitte.
The move will save 35 sites and 669 jobs from its original network of 61 restaurants and 1,031 employees.
Gavin Maher, joint administrator at Deloitte, said: "As with a number of dining businesses, the broader challenges facing 'bricks and mortar' operators, combined with the effect of the lockdown, resulted in a deterioration in financial performance and a material funding requirement.
"We have been working closely with the management team under very difficult market conditions to try and find a funding solution and I am glad to be able to announce the rescue of this well-loved brand together with a large proportion of the sites and workforce.
"However, it's clearly disappointing that a number of sites have had to close resulting in today's redundancies."
It is the latest expansion in dining for Boparan, which is owned by "Chicken King" Ranjit Boparan and also owns the chains Giraffe and Ed's Easy Diner.