<P> Optimus decides the Autobots should no longer help humans since they revived Megatron, but Cade convinces Optimus to not lose faith in them . Back at the facility, Galvatron reactivates himself and takes control of the K.S.I. drones . A battle breaks out in Hong Kong's streets between Cade's group, the Autobots, Cemetery Wind, Galvatron, and his drones . During the fight, Optimus forms an alliance with the Dinobots, while Bumblebee kills Stinger . Lockdown returns to recapture Optimus and the Dinobots, first by using a large magnet in his ship that picks up and drops metal objects, causing destruction to the city . After disabling the magnet, Optimus fights Lockdown at an abandoned factory . In the ensuing duel, Optimus kills Attinger (who still believes all Transformers are a threat) to save Cade before being impaled with his own sword by Lockdown . Cade and Bumblebee fight Lockdown while Tessa and Shane use a tow truck to free Optimus, who kills Lockdown before using one of his grenades to finish off the remaining drones . Now the only surviving drone, Galvatron retreats, vowing to return . </P> <P> As Lockdown's ship leaves Earth, Optimus tells the Autobots to protect the Yeagers and lets the Dinobots go . Joshua also offers to help the Yeagers build a new home . Optimus then flies away into space with the Seed to hide it away, while sending a message to the Creators that he is coming for them . </P> <Ul> <Li> Mark Wahlberg as Cade Yeager A single father and struggling inventor . </Li> <Li> Stanley Tucci as Joshua Joyce The ambitiously arrogant head of KSI who wants to build his own Transformers . </Li> <Li> Kelsey Grammer as Harold Attinger A paranoid CIA operative and government official who created the CIA black - ops unit, Cemetery Wind to eliminate all Transformers, Autobot or Decepticon, from Earth . </Li> <Li> Nicola Peltz as Tessa Yeager Cade's daughter who is secretly dating Shane . </Li> <Li> Jack Reynor as Shane Dyson Tessa's boyfriend and an Irish rally car driver . </Li> <Li> Titus Welliver as James Savoy A ruthless CIA Agent and second - in command of the Cemetery Wind working for Attinger . </Li> <Li> Sophia Myles as Darcy Tirrel Joshua's geologist assistant and ex-girlfriend . </Li> <Li> Li Bingbing as Su Yueming (苏月明 Sū Yuèmíng) The owner of the Chinese factory used by KSI to build their artificial Transformers . </Li> <Li> T.J. Miller as Lucas Flannery Cade's best friend and a mechanic . </Li> <Li> James Bachman as Gill Wembley A scientist working with Joshua Joyce at KSI . </Li> <Li> Thomas Lennon as the Chief of Staff . </Li> </Ul> <Li> Mark Wahlberg as Cade Yeager A single father and struggling inventor . </Li>

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