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in the Animated universe, Buzzsaw, Sunder and Garboil were 'prototype' versions of Laserbeak that Soundwave eventually discarded. (2009)
In early drafts of The Transformers: The Movie, Lithone was to be a planet populated by living rock creatures, and Kranix was to be "Granix", from "granite". that Arblus was originally supposed to be Marblus, from "marble". (1986)
two different designs for Animated Barricade: one based on Prowl (due to them both being police-themed), and one based on his live-action movie self. (2010)
both Dreamwave Smokescreen and IDW Soundwave made use of rubsigns.
IDW Alpha Trion seems to turn into the Tumbler from the Dark Knight trilogy. (2012)
G1 Red Alert's character model differed significantly from Sideswipe's despite being based on the same G1 toy mould, being closer to the G1 toy.
thus, MP Red Alert is not really show-accurate as it is a direct redeco of Sideswipe. (2012)
in the final issue of Regeneration One, cracks begin to form in the multiverse, and characters from all across the franchise are seen in a vision. (2014)
Grimlock Bird turns into a wheelbarrow. (2014)
IDW Galvatron turns into a military vehicle that was cancelled in real life, the reasoning for this being that military technology would advance differently in a universe full of giant robots stomping around. (2014)