The Transformers: The Return of Unicron

 is a 2018 Canadian-American direct-to-video animated action movie based off the Transformers franchise. Based on the original 1980s incarnation of the franchise, it features the surviving voice actors from the incarnation's animated series reprising their roles, assisted by soundalikes of the deceased/retired voice actors.

Autobots

 * as Optimus Prime and Ironhide
 * as Bumblebee
 * as Cliffjumper and Ratchet
 * as Wheeljack and Kup
 * as Prowl, Sideswipe, and Swoop
 * as Windblade
 * as Arcee and Beta
 * as Jazz and Red Alert
 * as Powerglide
 * as Hot Rod/Rodimus Prime
 * as Wheelie, Sludge, and Mirage
 * as Hound and Eject
 * as Springer and Slag
 * as Brawn and Dion
 * as Nancy
 * as Gears and Wreck-Gar
 * as Ultra Magnus and Bluestreak
 * as Snarl
 * as Jetfire and Grimlock
 * as Blaster and Alpha-Trion
 * Javier Pontón as Radio AM Robot
 * as Caminus
 * as Beachcomber and Seaspray
 * as Devcon
 * as Blurr and Punch
 * as Elita-One and Firestar
 * as Chromia
 * as Moonracer

Deceptions

 * as Megatron, Soundwave, Skywarp, Rumble, Frenzy, Ravage, and Mixmaster
 * as Starscream
 * as Thundercracker
 * as Reflector
 * as Astrotrain
 * as Shockwave
 * as Scrapper and Bombshell
 * as Hook and Bonecrusher
 * as Shrapnel
 * as Long Haul
 * as Counterpunch
 * as Blitzwing
 * as Kickback
 * as Devastator
 * as Scavenger
 * as Laserbeak

Others

 * as Unicron
 * as Spike Witwicky
 * as Carly Witwicky
 * as Daniel Witwicky
 * as Sparkplug Witwicky (flashback sequence only)