One Step Changers

1-Step AOE Galvatron

One-Step Changers is a size class that originated in the Age of Extinction toyline and has been a part of nearly every show and movie toyline since then. The line largely consists of figures smaller than Deluxe Class that (as the name suggests) can transform in 1 step, and typically feature limited articulation. Though sometimes, a few extra steps may be needed to finish their transformation! The transformation mechanism varies by figure and line, with many using springs similar to the Activators and Rescue Bots toys while others use Automorph-type gearing/levering. Some toys in this class also had variety of gimmicks beyond just the 1-Step transformation.

Alongside Hasbro, TakaraTomy would receive some 1-Step Changers under various names of their own, including ones based on the characters from Bumblebee film.

Toys

Age of Extinction

Age of Extinction was the first toyline to feature 1-Step Changers, under its Robots in Disguise banner. The majority don't feature any spectacular gimmicks beyond their quick transformations, however the larger toys feature some cool gimmicks, including a Stomp & Chomp Grimlock with electronics that could interact with most of the One-Step Changers in the line. Takara got a big toy of their own called Battle Command Optimus Prime, that like Stomp & Chomp Grimlock, features electronics that allow him to interact with the smaller 1-Step Changers, while also being a figure of his own.

Wave 1 Autobot Drift Grimlock Optimus Prime		Wave 1.5 Lockdown		Wave 2 Bumblebee Crosshairs Autobot Hound Dinobot Slash		Wave 3 Decepticon Stinger		Wave 1 Drift
Wave 4 Autobot Drift (helicopter) Galvatron High Octane Bumblebee Dinobot Slug Steeljaw		Wave 5 Dinobot Strafe Megatron Prowl Rollbar		Mega One-Step Mega 1-Step Bumblebee		Electronic Stomp & Chomp Grimlock
Exclusives Transformers: Age of Extinction Collection (Bumblebee, Autobot Drift, Lockdown, Silver Knight Optimus Prime, Grimlock, Dinobot Slug)				TakaraTomy Exclusives LA-01 Battle Command Optimus Prime LA-14 Battle Command Optimus Prime & Bumblebee Strongest Tag Set

Robots in Disguise (2015)

The Robots in Disguise toyline's 1-Step Changers are not too different from the Age of Extinction ones, with the exception of their badges being able to be scanned for the Mobile App.

Wave 1 Bumblebee Sideswipe Strongarm Underbite		Wave 2 Fixit Grimlock Steeljaw		Wave 3 Autobot Drift Decepticon Fracture Thunderhoof		Wave 4 Night Ops Bumblebee Ninja Mode Sideswipe		One-Step Thunderhoof
Wave 5 Gold Armor Grimlock Patrol Mode Strongarm		Wave 6 Bumblebee (new tooling) Quillfire Sideswipe (new tooling) Springload		Wave 7 Optimus Prime (new tooling) Blizzard Strike Sideswipe Strongarm (new tooling)		Wave 8 Bisk Energon Boost Bumblebee Autobot Ratchet
Wave 9 Bumblebee (new tooling) Autobot Drift (new tooling) Optimus Prime (new tooling)		Wave 10 Blurr Sideswipe (new tooling)		Wave 11 Heatseeker Strongarm (new tooling)		Wave 12 Soundwave
Other Stomp & Chomp Grimlock		Exclusives Robots in Disguise Collection (Bumblebee, Grimlock, Optimus Prime "Special Edition Figure", Sideswipe, Steeljaw, and Underbite)

The Last Knight

The The Last Knight toyline had the slightly renamed 1-Step Turbo Changers, with several molds reused from the Age of Extinction line. All of the figures feature flame deco printed in UV-reactive invisible ink, which can be revealed with the UV "Cyberfire" light in the large Mega 1-Step Turbo Changer Dragonstorm figure. Despite appearing as prefixes in several online retailers' listings for the wave 1 figures, the term "Cyberfire" doesn't actually appear as a gimmick call-out on the toys' packaging until wave 3, including packaging variants for additional shipments of figures that debuted in earlier waves.

Wave 1 Autobot Hound Barricade Bumblebee Optimus Prime		Wave 2 Decepticon Berserker Grimlock Megatron		Wave 3 Autobot Drift Cogman Scorn		Mega 1-Step Turbo Changer Dragonstorm		Wave 3 Scorn
Exclusives Autobots Unite 1-Step Turbo Changer 2-Pack (Bumblebee & Autobot Hot Rod) Reveal the Shield 1-Step Turbo Changer Mega Pack (Optimus Prime, Bumblebee, Grimlock, Hound, Megatron, and Barricade)

Turbo Change Series

Along side their original TLK repaints, Takara made a subline made for a bunch of the turbo changers from the line, tho we're only focusing on the 1-Steps for the line. Alongside the normal 1-Step Changer repaints, they also made a couple of figures based on the Bumblebee film. And as part of the normal waves, Battle Command Optimus Prime returns as the big interactive toy with 2 releases like last time.

Wave 2 TC-05 Bumblebee TC-06 Optimus Prime TC-07 Megatron TC-08 Grimlock TC-09 Battle Command Optimus Prime		Wave 3 (July 21) TC-10 Autobot Hot Rod TC-11 Autobot Drift TC-12 Dinobot Slug		Wave 4 (October 27) TC-13 Battle Command Optimus Prime - Strongest Directive Set		Wave 4 Optimus Prime, based on the BBM design
Wave 5 (December 27) TC-14 Optimus Prime TC-15 Barricade TC-16 Bumblebee

Cyberverse

The Cyberverse toyline had normal 1-Step Changers in the first year, including repaints from Robots in Disguise 1-Steps for Wave 1. It introduced "Action Attack" gimmicks with Wave 3, giving each figure some kind of action feature that wasn't there with previous 1-Step Changers.

Wave 1 (2018) Bumblebee Blurr Soundwave		Wave 2 (2018) Megatron Optimus Prime Starscream		Wave 3 (2019) Bumblebee (new mold) Megatron (new mold) Optimus Prime (new mold) Prowl		Wave 4 (2019) Autobot Hot Rod Wheeljack		Wave 3 Bumblebee
Wave 5 (2019) Shockwave Sky-Byte		Wave 6 (2019) Autobot Jazz		Wave 7 (2020) Bludgeon Autobot Whirl		Wave 8 (2020) Repugnus Stealth Force Bumblebee
Wave 9 (2020) Megatron (Cybertronian Mode) Autobot Ratchet (Cybertronian Mode)		Wave 10 (2020) Megatron X		Exclusives Repugnus Revenge (Repugnus, 3 Pesticons) Sharkticons Attack (Stealth Force Hot Rod, 3 Sharkticons)

Buzzworthy Bumblebee

The co-branded Buzzworthy Bumblebee toyline re-released a good number of 1-Step Changers, mainly from Cyberverse.

Age of Extinction (2020) Mega 1-Step Bumblebee

Cyberverse 1-Step Changers wave 1 (2022) Bumblebee Wheeljack Shockwave

Cyberverse 1-Step Changers wave 2 (2022) Optimus Prime Megatron Sky-Byte

Cyberverse 1-Step Changers wave 3 (2023) Prowl Starscream

Mega 1-Step Bumblebee

Earthspark

The Earthspark toyline had 1-Step Flip Changers, whose gimmick involved pushing the figures so they fall over, triggering a transformation into their vehicle modes. In 2025, they were replaced by 1-Step Smash Changers, with the gimmick being that you'd have to smash them to the ground in order to transform them into robot mode.

Flip Changers Wave 1 Bumblebee Optimus Prime Wheeljack		Flip Changers Wave 2 Soundwave Swindle		Flip Changers Wave 3 Megatron Terran Twitch		Flip Changers Wave 4 Breakdown		1-Step Flip Changer Optimus Prime 1-Step Smash Changer Thrash
Flip Changers Wave 5 Elita-1 Skullcruncher		Flip Changers Wave 6 Chaos Terran Spitfire		Smash Changers Wave 1 Bumblebee Megatron Optimus Prime Terran Thrash		Smash Changers Wave 2 Terran Jawbreaker Terran Twitch

One

Like with Earthspark, Transformers One's Cog Changers involved a gimmick special to their line, where you'd slide up a transformation cog shaped panel on their chest in robot form and press it to transform them into their vehicle forms. The only 1-Step figures from the line that didn't do this were in the Iacon Race 3-Pack, which were retools of prior 1-Step molds.

Cog Changers Wave 1 Airachnid Bumblebee/B-127 Wheeljack

Cog Changers Wave 2 Optimus Prime/Orion Pax Megatron/D-16 Sentinel Prime

Exclusives Iacon Race 3-Pack (Megatron/D-16, Optimus Prime/Orion Pax, & Autobot Mirage)

Cog Changers Airachnid