The Mighty Morphin' Megazord.

Whenever a team of Power Rangers are struggling in battle, and their Zords alone cannot cope, they will often merge their Zords together to form a mighty Megazord. Since by this time, the monster of the week will often have grown to gargantuan heights, a Megazord will usually be more than a match for the monster. While initially five Zords were needed to form a Megazord, since Ninja Storm the minimum number of Zords has been reduced to three. Every Megazord depicted in Power Rangers has held the ability to combine with later introduced Zords, usually belonging to additional members to the current series' Ranger team. Depending on the series in question, this can either lead to a vastly more powerful robot, or even have more than one Megazord in battle.