During world boss battles, Merco pilots the PHOENIX γ as long as he is playable. In this game, Merco attacks using his spear, firing waves of energy and attacking using his speed, but Merco can use his shield to defend himself. In world boss battles, Tarus drives the SASQUATCH β while he is playable. In this game, Tarus attacks by throwing rocks at enemies, as well as attacks enemies with punches, but Tarus also has the ability to dig. He is one of the members of the Bestector.

In world boss battles, Lunar drives the CERBERUS α during battle as long as he is playable. In this game, Lunar attacks using his machine gun, as well as kicking and throwing grenades.

Additionally, Marina enlists the help of Beastector to restore peace to Planet Clancer once again. In this game, Marina uses the same moves she used in the Mischief Makers game released for the Nintendo 64. It's the Ultra-InterGalactic-Cybot G girl who returns to restore peace to Planet Clancer once again, but this time from the dirty hands of the Grossalins. While Marina is trying to stop the Grossalins from taking over Planet Clancer, Lunar, Tarus and Merco reappear and team up with Marina to save Planet Clancer from the Grossalins' dirty hands. So, Marina must fight the Grossalins to try to restore peace to Planet Clancer once more. Suddenly, an army of evil alien ants called Grossalins invade Planet Clancer and attempt to take possession of Planet Clancer. When the Clancers notice Marina and Professor Theo's presence on Planet Clancer, Celes, now the ruler of Planet Clancer, appears to congratulate Marina and Professor Theo on their return to Planet Clancer. Marina and Professor Theo return to Planet Clancer to see how things are going, but realize that Planet Clancer is more sociable than ever since the last time Marina and Professor Theo were on Planet Clancer.

Mischief makers