Powermasters and Godmasters have a small figure that transforms into an engine. The engine is then placed into a special slot that enables the Transformer to transform into his or her robot mode.
Buster (1988 - Godmaster - Japan)
Convoy (Nucleon Quest) (2001 - Japan)
Darkwing (1988 - G1 Powermaster)
Doubleclouder (1988 - Godmaster - Japan)
Doubledealer (1988 - G1 Powermaster)
Dreadwind (1988 - G1 Powermaster)
Getaway (1988 - G1 Powermaster)
God Ginrai (1988 - Godmaster - Japan)
God Ginrai (2002 - Fire Guts - Japan)
Hydra (1988 - Godmaster - Japan)
Joyride (1988 - G1 Powermaster)
Optimus Prime (1988 - G1 Powermaster)
Optimus Prime with Apex Bomber (2002 - CS II)
Overlord (1988 - Godmaster - Japan)
Ranger (1988 - Godmaster - Japan)
Slapdash (1988 - G1 Powermaster)
Super Ginrai (1988 - Godmaster - Japan)
Super Ginrai (2002 - Fire Guts - Japan)

NEBULANS & GODMASTERS
Aquastar (1988 - Godmaster - Japan)
Bullet / Borest (1988 - Godmaster - Japan)
Buster (1988 - Godmaster - Japan)
Clouder (1988 - Godmaster - Japan)
Clouder (1988 - Godmaster - Japan)
Giga (1988 - Godmaster - Japan)
Ginrai (2002 - CS II)
God Ginrai (1988 - Godmaster - Japan)
HiQ (1988 - G1 Powermaster)
HiQ (2001 - Nucleon Quest)
Hi-test (1988 - G1 Powermaster)
Hotwire (1988 - G1 Powermaster)
Hydra (1988 - Godmaster - Japan)
Knok (1988 - G1 Powermaster)
Lube (1988 - G1 Powermaster)
Mega (1988 - Godmaster - Japan)
Rev (1988 - G1 Powermaster)
Skar (1988 - G1 Powermaster)
Super Ginrai (1988 - Godmaster - Japan)
Throttle (1988 - G1 Powermaster)
Zetoca (1988 - Godmaster - Japan)