地球上的戰爭雖然結束，但變形金剛之間的戰爭並未告終。紅蜘蛛飛回塞博坦星球，打算帶著霸天虎軍隊再回地球與汽車人壹決死戰。汽車人發現威震天的屍體不見了，原來已被薩克巨人偷走，威震天隨後被再次激活，決心反攻汽車人。與此同時，紅蜘蛛也率領塞博坦的援軍趕來。壹直生活在地球人類之間的汽車人這時也已經增強了自己的戰鬥力，壹場大戰所難免。男孩兒山姆因為掌握了有關變形金剛的起源以及古老時期到訪地球的線索而遭到霸天虎的追擊。霸天虎為了獲取這些信息，妄圖生擒山姆。汽車人、美軍和其它多國部隊聯合起來抵抗霸天虎的襲擊。最後人類和汽車人戰勝了霸天虎，地球恢復了和平。
On?although?Earth's?war?ended,?but?between?the?distortion?Jin'gang's?war?has?not?come?to?an?end.?The?red?spider?flies?back?fills?the?abundant?Tanzania?star,?planned?that?brings?the?tyrant?day?tiger?army?to?return?to?the?Earth?and?an?automobile?person?desperate?fighting?again.?The?automobile?person?discovered?that?overawes?the?day?the?corpse?to?disappear,?originally?was?stolen?away?by?the?Sack?giant,?overawes?the?day?to?activate?once?more?afterward,?was?determined?that?counter-attacks?the?automobile?person.?Meanwhile,?the?red?spider?also?leads?to?fill?the?abundant?Tanzania's?subsidiary?troops?to?catch?up?with.?The?life?also?already?has?strengthened?own?battle?efficiency?by?now?between?the?Earth?humanity's?automobile?people,?a?war?unavoidable.?Because?boy?Sam?has?grasped?the?related?distortion?Jin'gang's?origin?as?well?as?the?ancient?time?visits?Earth's?clue?to?encounter?the?tyrant?day?tiger's?pursuit.?Dominates?the?day?tiger?to?gain?these?information,?attempts?to?capture?alive?Sam.?The?automobile?person,?the?US?military?and?other?Multinational?force?join?up?resist?the?tyrant?day?tiger's?attack.?Finally?the?humanity?and?the?automobile?person?defeated?the?tyrant?day?tiger,?the?Earth?regained?peace.