Rumbler is the name of two fictional characters from the Transformers series. The original Rumbler was introduced in 1991 as part of the Action Master group. He is a member of the Autobot Elite Guard Stealth Team.
Transformers: Generation 1
Rumbler is an Autobot Action Master who specials in front line defense. He is the brother of Sprocket.
Usually called into action in times of severe crisis. Often part of the first line of defence against Decepticon attack. His all-terrain vehicle converts into exo-suit armour shielded by ten inches of pure titanium. Able to withstand repeated Decepticon photon blasts while its rotating defence pounders smash through the attackers. A massive, roving repellor able to maul down anything in its path.
Rumbler appeared in "A Team Effort" by Fun Publications.
When most of the members of the Autobot Elite Guard, including Rumbler, confronted Bruticus they were nearly wiped out, with Bruticus killing most of the Guard. Dion was able to blind Bruticus, forcing it to seperate into the Combaticons, but the Combaticons finished off most of the remaining Guard, including Metalhawk, who was killed by Onslaught. This seemingly left only Dion alive, burried in the rubble, and Thunderclash's team, which was off planet at the time. 
Rumbler returns in "Battle Lines", where it is revealed that he and several other Elite Guard survived the attack by Bruticus. The arrives in time to help Magnum's team against the Decepticon forces of Deathsaurus.  Rumbler is among the Autobots present when Megatron attacks Iacon with his new weapon, Devastator.
- Generation 1 Action Master Rumbler (1991)
- Rumbler is a European exclusive recolor of Sprocket. He came with a vehicle that turned into suit he could wear.
Shattered Glass Rumbler is the drone partner of Megatron. He can act as a cannon for Megatron or form a neutronic blade weapon.
In the Fun Publications story "Shattered Glass" Megatron recruits the Autobot Cliffjumper from an alternate reality to aid him against the Autobots of his world. He later leads an attack on the Autobot's Ark launch site. 
Megatron appears in the fiction Dungeons & Dinobots, a text based story. He defends the Arch-Ayr fuel dump from an Autobot attack. He later sends several of his troops to capture and reprogram the rogue Dinobots built by the mad Autobot scientist Wheeljack.
Megatron is captured by the Autobot Targetmasters in Do Over, but was freed thanks to help by the Predacons and Whisper. When confronted by Optimus Prime he attempts to use the Autobot Targetmaster Nightstick to shoot the Autobot leader, but Nightstick takes control of Megatron's arm. Megatron then tricks Optimus into using Megatron's own weapon to cut Megatron's hand off, freeing him from Nightstick. Megatron misses the launching of the Decepticon ship Nemesis, which is taken over by Starscream to counter Autobot ship Ark.
In Reunification, Megatron greets a Quintesson and the dimensional travelers Breakaway, Topspin Skyfall and Landquake after their escape from the Autobot combiner Computron. Megatron introduces the travelers to Heatwave, but then is shot by the traitor Cyclonus, who is working for Alpha Trion. The travelers try to combine their powers with Heatwave to return Megatron to life, but instead have a vision of Skyfall and are combined into Nexus Prime. Nexus Prime resurrect Megatron as Galvatron.
Galvatron appears in a flashback in The Coming Storm.
- Timelines Voyager Megatron with Rumbler and Divebomb (2008)
- Megatron is a remold of Energon Voyager Megatron with the colors of Generation 1 Megatron and a new head sculpt based on a design prior to the release of the original G1 series. He came packaged with the Decepticon Mini-Con Divebomb and the Autobot Rodimus.
- Jesse Wittenrich & Pete Sinclair (w), Dan Khanna (p), Josh Warner (i), Thomas Deer (col), Jesse Wittenrich (let), Pete Sinclair (ed). "The Coming Storm: Part 6" The Transformers Collectors Club 36 (Dec/Jan 2011), Fun Publications
- Pete Sinclair & Jesse Wittenrich (August/September 2011). "Battle Lines Part 4". Transformers Collectors Club Magazine 1 (40): 9–14.
- Pete Sinclair & Jesse Wittenrich (October/November 2011). "Battle Lines Part 5". Transformers Collectors Club Magazine 1 (41): 10-15.
- Pete Sinclair & Benson Yee (w), Don Figueroa (p), Don Figueroa (i), Espen Grundetjern (col), Jesse Wittenrich (let), Pete Sinclair & Brian Savage (ed). "Shattered Glass" Transformers Timelines v2, 3 (Botcon 2008), Fun Publications
- S. Trent Troop and Greg Sepelak (2008). Dungeons & Dinobots. Illustrator Evan Gauntt. Fun Publications.
- S. Trent Troop and Greg Sepelak (2009). Do Over. Illustrator Yuki Oshima. Fun Publications.