The company had initially entered the cruise market in 1973, but due to rising fuel costs the venture was terminated in 1976. In 1995, Thomson restarted their cruise line after their competitor Airtours had made a successful entry in the cruise business under their Sun Cruises brand. On 9 October 2017, TUI Group announced that Thomson Cruises would be rebranded in late October 2017 as Marella Cruises, with all of the existing Thomson fleet adopting the name change either from Thomson or TUI to Marella (except Thomson Spirit which will be renamed Spirit and Thomson Majesty which will be transferred to Celestyal Cruises). The line also announced that it would base TUI Discovery in Asia for the Winter season of 2018, with the ship being based out of Malaysia, the first in the line’s history.
In 2012, Marella Cruises holds approximately a 1% market share of the worldwide cruise industry.