Blackadder made the squad for the first time last month to play Tonga and Fiji. His debut came off the bench against Tonga at Mount Smart Stadium in the 102-0 win. He became All Black No 1195.
Canterbury's 125-test lock Samuel Whitelock will again captain the All Blacks in the absence of Sam Cane, who is still recovering from chest surgery. Midfielder Jack Goodhue was not considered for selection due to injury.
The 36-man squad named today for the upcoming Rugby Championship will see 69-test halfback TJ Perenara returning to the side.
Having recently returned from Japan, Perenara is following a progressive return in club and NPC rugby.
New All Black Finlay Christie will remain as temporary cover with the squad.
Props Ofa Tuungafasi and Joe Moody also return to the All Blacks. Prop George Bower will remain with the squad as injury cover for Moody, who is not expected to return to test rugby until after the Bledisloe Cup series.
Hooker Samisoni Taukei'aho will also stay with the All Blacks squad as cover for Asafo Aumua who missed the last two tests of the July series. Aumua may also play the opening round of the NPC to build his match fitness.
Meanwhile, it's also a welcome back to midfielder Braydon Ennor, who missed the first three tests of the year to undergo appendicitis surgery.
All Blacks Head Coach Ian Foster said: "It's exciting to be naming the squad for the Rugby Championship and we can't wait for the next phase of our test season.
"The Steinlager Series gave us a great opportunity to grow some depth and experience. It also enabled us to re-establish some returning players, both from overseas or from injury. The Bledisloe Cup plus the Rugby Championship are pinnacle challenges for us and remain as our top priorities. There is real excitement in the group for these opportunities in front of us."
The All Blacks will have a two-day camp in Christchurch next week before assembling in Auckland for the pre-Rugby Championship Bledisloe Cup test at Eden Park on Saturday, August 7.
The second Bledisloe Test is at Optus Stadium, Perth, on Saturday 21 August, with the third back home at Sky Stadium, Wellington, the following Saturday 28 August.
"Our players are looking forward to spending some time at home before what is shaping up to be a hugely-competitive Rugby Championship. The Bledisloe Cup Series is a great way for us to kick off this part of the season," Foster said.
"It's our first challenge; we're playing for a trophy that is massively important to us, and we're both coming in fresh off our respective Series wins, so it bodes well for a great Series."
Following the Bledisloe Cup Series, the All Blacks will then play four tests in a row in September, with back-to-back tests against Argentina, at Eden Park on Saturday 11 September and Sky Stadium, Wellington, on Saturday 18 September.
The All Blacks then head to Dunedin for the 100th test between the All Blacks and South Africa at Forsyth Barr Stadium on Saturday 25 September with the team's final Rugby Championship test against South Africa at Eden Park on Saturday 2 October.
Foster said the team was again looking forward to playing the Pumas and relishing the return of the Springboks to the Rugby Championship.
"Having the South Africans back in the Championship is going to be exciting for everyone. We haven't played them since Rugby World Cup 2019 so there'll be a lot of anticipation about them, and the 100th Test match is going to be an extra special occasion."
Forwards
Hookers
Asafo Aumua (24, Hurricanes / Wellington, 2)
Dane Coles (34, Hurricanes / Wellington, 76)
Codie Taylor (30, Crusaders / Canterbury, 58)
Props
Nepo Laulala (29, Blues / Counties Manukau, 31)
Tyrel Lomax (25, Hurricanes / Tasman, 8)
Joe Moody (32, Crusaders / Canterbury, 50)
Angus Ta'avao (31, Chiefs / Auckland, 16)
Karl Tu'inukuafe (28, Blues / North Harbour, 18)
Ofa Tuungafasi (29, Blues / Auckland, 39)
Locks
Scott Barrett (27, Crusaders / Taranaki, 42)
Brodie Retallick (30, Chiefs / Hawke's Bay, 83)
Patrick Tuipulotu (28, Blues / Auckland, 38)
Tupou Vaa'i (21, Chiefs / Taranaki, 4)
Samuel Whitelock (32, Crusaders / Canterbury, 125) – captain
Loose Forwards
Ethan Blackadder (26, Crusaders / Tasman, 2)
Shannon Frizell (27, Highlanders / Tasman, 14)
Akira Ioane (26, Blues / Auckland, 4)
Luke Jacobson (24, Chiefs / Waikato, 5)
Dalton Papalii (23, Blues / Counties Manukau, 5)
Ardie Savea (27, Hurricanes / Wellington, 50)
Hoskins Sotutu (23, Blues / Counties Manukau, 6)
Backs
Halfbacks
TJ Perenara (29, Hurricanes / Wellington, 69)
Aaron Smith (32, Highlanders / Manawatu, 99)
Brad Weber (30, Chiefs / Hawke's Bay, 9)
First five–eighths
Beauden Barrett (30, Blues / Taranaki, 91)
Richie Mo'unga (27, Crusaders / Canterbury, 24)
Midfielders
Braydon Ennor (23, Crusaders / Canterbury, 1)
David Havili (26, Crusaders / Tasman, 5)
Rieko Ioane (24, Blues / Auckland, 37)
Anton Lienert-Brown (26, Chiefs / Waikato, 50)
Quinn Tupaea (22, Chiefs / Waikato, 1)
Outside backs
Jordie Barrett (24, Hurricanes / Taranaki, 25)
George Bridge (26, Crusaders / Canterbury, 12)
Will Jordan (22, Crusaders / Tasman, 5)
Damian McKenzie (26, Chiefs / Waikato, 30)
Sevu Reece (23, Crusaders / Tasman, 10)
