Battleflex, often called Flex, is the loyal, sentient, non-transforming, car driven by Rom Stol. He has expanding tires which can tackle any terrain.
In episode 2, "Wolf Sword! Call Forth the Thunder of Courage!" Rom and friends attended the funeral of his father, where Rom called Battleflex took on a quest to follow the Wolf Sword's directions to oppose the Gandora threat to Cronos. This quest would lead the companions to Sado fortress with the Wolf Crest which attacked by Grujious and the Devil Satan 6. Rom and friends were captured by the Gandora when the people of the fortress betrayed them, but a Battleflex and a boy named Ziggy free them.
In episode 3 "Steal the Metal Laster!", Rom Stol and his friends were traveling when Rod Drill fell into an acid swamp, which caused him to rust. The group traveled to the nearby village of Vira in an attempt to get water to clean Rod. The village was attacked by the Devil Satan 6, who were looking for the Metal Laster for Gades, which was rumored to cure rust and aging. Rom battled the 6, but they got away with a jug which they thought contained the Metal Laster. Luckily the jug contained acid from the swamp. Rod was cured of his rust by the real Metal Laster, and they made a friends with the people of the village, particularly Min, the daughter of the village chief. 
Battleflex appeared in episode 27, "The Magic Mountain Knight Maskrock". In the episode Battleflex was part of a Yamilan City volunteer group lead by Rom Stol that went to retrieve the Metal Laster cure for Gandora rust poison gas which has effected Reina and some school children.
Note: In some English subtitles of the series Battleflex is called Felix.
- Bandai Machine Robo MRC Battleflex (1986)
- A recolor of the toy released as Power Machines Flex by Galoob.
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