Territory Alliance — a party calling for a "revolution" in politics — will attempt to seize Opposition status from the Country Liberals if it wins this weekend's by-election in Johnston.

Key points: The CLP is the current NT Opposition with two seats in Parliament

The CLP is the current NT Opposition with two seats in Parliament If Territory Alliance wins the Johnston by-election, it will also have two seats

If Territory Alliance wins the Johnston by-election, it will also have two seats Independent MLA Jeff Collins is considering joining Territory Alliance

The electorate of Johnston in Darwin's northern suburbs has been held by Labor since 2001.

But its status as a safe Labor seat has been compromised following the departure of former member Ken Vowles, who has been a vocal critic of Labor Chief Minister Michael Gunner since he was banished from caucus in December 2018.

If Territory Alliance candidate Steven Klose wins on Saturday, the party would end up with the same number of seats in Parliament as the current CLP Opposition.

Territory Alliance leader Terry Mills said if that scenario eventuated, he would seek an equal distribution of the resources that come with being the Opposition.

"I think the right thing to do is to challenge for proper resourcing so that government can be held to account and the Parliament works better."

Mr Mills said his party could secure Opposition status in its own right if it convinced at least one other MLA to join Territory Alliance.

The most likely candidate is former Labor-turned-independent politician Jeff Collins, who has been actively campaigning alongside Mr Mills and Mr Klose in Johnston this week.

Northern Territory MP Jeff Collins is considering joining Territory Alliance. ( ABC News: Brendan Esposito )

"I think by coming out and doorknocking is an indication of [Mr Collins'] support," Mr Mills said.

Mr Collins said he would make a final decision about whether to join Territory Alliance within the next month, after consultation with his constituents.

"I'd have to say it'd be a 50-50 at this point in time," Mr Collins said.

"There's a lot of what Territory Alliance and what Terry Mills says that I like and I agree with."

Mr Mills is a former CLP chief minister who established Territory Alliance last year, saying he wanted to improve governance after decades of "political dysfunction".

'Wolf in sheep's clothing'

Mr Mills said both the CLP and Labor were concerned about the implications of a Territory Alliance win in Johnston.

He noted the CLP had preferenced Labor ahead of his own party on its how-to-vote cards.

"The CLP is terrified that they are going to lose their Opposition status," Mr Mills said.

He also pointed to Labor's recent attempts to discredit him as a sign that it saw Territory Alliance as a threat.

Steven Klose is running for Territory Alliance in the party's first test at the polls. ( ABC News: Felicity James )

In Parliament last week, Labor backbencher Kate Worden raised questions about a lucrative contract Mr Mills signed in 2014 to become the Territory's commissioner to Indonesia.

"When Territorians know the facts, they will see the Member for Blain as I do: a wolf in sheep's clothing," she said.

Mr Mills said the major parties were worried about the emergence of a new political force.

"They seem to be working together, certainly not in the interests of good governance for the Territory, but their own political interests," he said.

"So I think on that basis, it's right that we would challenge for Opposition status."

The Johnston by-election could have implications for the status of opposition parties. ( ABC News: Felicity James )

If Mr Mills were to become the new Opposition Leader, he would get a 65 per cent boost to his base salary, while his deputy would receive 30 per cent more, and the party's whip would get a 15 per cent increase.

A Territory Alliance Opposition would also receive extra staff and resources, giving it a boost ahead of the Territory-wide election in August.

But Mr Mills said that was not why he wanted to secure Opposition status.

"There are a lot of cynical folk out there. But what is required is good policy," he said.

"Our [ultimate] objective is not Opposition. Our objective is to change the government."

Speaker Kezia Purick said if Territory Alliance ended up with two seats, it would be up to Parliament to decide which party should hold Opposition status.

But if Territory Alliance secured three seats, it would become the new Opposition.

"Three members of one party beats two members of another party — that's a given, that will just happen," Ms Purick said.

"[It's] nothing to do with the Speaker, nothing to do with the Legislative Assembly, nothing to do with the Government — it would just be a convention within Parliament."