Dynamo is Hector Dialonzo, a member of the superhuman Neo-Knights. He has the power to tap into the Earth to fly, create energy blasts and create earthquakes. He also develops a more limited ability to tap into Cybertron.
Marvel Comics Continuity
Hector Dialonzo was a factory worker who discovered the mutant ability to channel the energies of the Earth during a Decepticon attack. He drove them off, then vanished, becoming known as 'Mister X'. Circuit Breaker, Starscream and G.B. Blackrock all tracked him down and attempted to convince him to join their cause. He ultimately opted to join forces with G.B. Blackrock.
He next appeared in costume as a member of the Neo-Knights. Now called Dynamo, he engaged the Decepticons during their brief civil war.
When Unicron attacked Cybertron, he attempted, with limited success, to tap into the power of Cybertron as he did on Earth.
After the Autobots and Decepticons abandoned Cybertron, his attunement to the planet led his fellow Neo Knights and the seemingly delusional Hi-Q to The Last Autobot, paving the way for the salvation of the planet.