With £2.28m including previews, Spider-Man: Into the Spider-Verse lands in second place.
Warner Bros proclaimed Aquaman “king of the box office as well as the seven seas”, as its oceanic superhero ended the two-week reign of Ralph Breaks the Internet at the top of the UK box office, taking £5.23m, including previews.
In addition to Spider-Verse and Ralph Breaks the Internet, the third animation in the Top 5 is The Grinch.
However, Aquaman delivered only the 16th-biggest opening of 2018; strip out the previews and it achieved £3.82m.