Although Territory Labor's landslide victory in the 2016 election was beyond doubt, a number of prospective ministers—including Labor deputy leader and presumptive Deputy Chief Minister Lynne Walker—had not been confirmed as winners in their seats. For this reason, Gunner had himself, Natasha Fyles, and Nicole Manison sworn in as an interim three-person government on 31 August 2016 until a full ministry could be named.
On 11 September, the following members were announced as ministers after a Labor Party caucus meeting. By this time, it had been confirmed that Walker had lost her own seat, so Gunner tapped Manison to become the new deputy leader of Territory Labor and hence Deputy Chief Minister. Gunner also announced that all backbench members of his large caucus will serve as junior ministers, at no extra cost to taxpayers. The new cabinet was sworn in the following day. Notably, it was majority-female; five of its eight members were women.
On 21 December 2018, Ken Vowles was expelled from the Cabinet for "breaking cabinet confidentiality". Assistant ministers Jeff Collins and Scott McConnell also lost their roles. Paul Kirby joined the ministry as Minister for Primary Industry and Resources.