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 that (as the name suggests) can transform in 1 step using springs similar to the Activators and Rescue Bots toys from earlier years. The toys continued into the Robots in Disguise and The Last Knight toylines (They were renamed to '1-Step Turbo Changers' for the ladder) with the same type of toys.

This would later change with the Cyberverse, Earthspark, and Transformers One toylines, as they introduced a variety of gimmicks beyond the 1-Step transformation.

Alongside Hasbro, Takara 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 (Robots in Disguise)

As the first toyline to feature 1-Steps, these don't feature any spectacular gimmicks beyond their quick transformations, however a lot of 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.

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)

Wave 3's Decepticon Stinger toy was redefined as a Walmart exclusive (see below) seemingly at the last minute. Judging by web retail listings, the intent was for Stinger to be replaced in the wave 3 case by Lockdown, but multiple retail sightings indicate that some quantity of cases was mistakenly packed per the original plan, leading to Stinger toys with "Walmart Exclusive" stickers being found at Target stores.

Robots in Disguise (2015)

These are nothing too special from the Age of Extinction 1-Steps from before, 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		Exclusives "Robots in Disguise Collection" (Bumblebee, Grimlock, Optimus Prime "Special Edition Figure", Sideswipe, Steeljaw, and Underbite)

The Last Knight (1-Step Turbo Changers)

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)

Cyberverse

While Cyberverse originally had normal 1 steps for the first year. (along with repaints from Robots in Disguise One-Steps for Wave 1) It introduced Action Attack gimmicks for Wave 3, giving each figure some kind of action feature that wasn't there with previous 1-Step Changers.

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

Earthspark

With Earthspark, the gimmick of the 1-Step transformation shifted with the 1-Step Flip Changers, which involve pushing the figures so they fall over and then transform into their vehicle modes. Although they've continued with this gimmick for the first 2 years of the line, in 2025, they rebranded them as 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

Transformers One (Cog Changers)

Like with Earthspark the previous year, Transformers: One's Cog Changers involved a gimmick special to their line, where you'd flip up their cogs in robot form and press it to transform them into their vehicle forms. The only figures from the line that didn't do this were the ones present in the Iacon Race 3-Pack

Wave 1 Airachnid Bumblebee/B-127 Wheeljack		Wave 2 Optimus Prime/Orion Pax Megatron/D-16 Sentinel Prime						Cog Changers Airachnid
Exclusives Iacon Race 3-Pack (Megatron/D-16, Optimus Prime/Orion Pax, & Autobot Mirage)