Five's Back To Reality show, in which 12 contestants fight for the title of "Britain's most popular reality star", has been a modest success with viewers.
Children's TV presenter Josie D'Arby is among the contestants
Sunday's opening show averaged 1.8m viewers, according to official figures.
The show was outperformed by Channel 4's Bremner, Bird and Fortune, which averaged 1.9m in the same time slot.
But the programme - Five's most costly commission ever - did better than C4's latest reality series, Regency House Party, watched by 1.1m on Saturday.
The network said its share of the audience on Sunday was double what the channel would usually get in the time slot.
On Monday's episode viewers saw Kerry McFadden, winner of ITV1 reality show I'm A Celebrity... Get Me Out Of Here!, visit the contestants at Five's studio mansion.
She brought champagne and ordered curry for them, before setting a challenge for three contestants to eat live bugs in exchange for a hot tub for the house.
The show brings together the former winners of some of British and US TV's best-known reality series to compete again for the title of champions' champion.
The 12 contestants are:
Nick Bateman, Jade Goody and Craig Phillips from Big Brother
Rik Waller from Pop Idol
Lizzy Bardsley from Wife Swap
James Hewitt and Josie D'Arby from The Games
Uri Geller and Catalina Guirado from I'm A Celebrity... Get Me Out Of Here!
Sarah Kozer from US show Joe Millionaire
Maureen Rees from Driving School
Ricardo Ribeiro from The Salon.
Phillips is 3/1 favourite with bookmaker Ladbrokes to win the show, followed by Hewitt and Goody at 4/1.