Mighty Morphin' Mario Rangers is blooper made by SMG4. As the title suggest, it's a parody of Mighty Morphin Power Rangers.
At the mall, Peach Toadstool, Luigi, SMG4, Toad and Mario are hanging out. Mario attempts to order spaghetti at McDonald's but Ronald McDonald refuses since they don't serve it. Mario throws a spatula at him resulting in the security guard appearing. Mario punches him then runs to his friends for help but they didn't care and throw him into a corner.
Security guards surround him so Mario calls for Jesus for help. Someone answers and warps Mario, SMG4, Toad and Luigi. They reappear in a base in space and The Great Shigeru Lord introduces himself as he summons them. He wants them to protect the universe but the gang don't care as they were about to leave.
The Great Shigeru Lord convinces them to stay as he shows a video of Dr. Pootis wrecking Nintendo City. Luigi ask why did he chose they as he believes they have special powers but Shigeru Lord replies that he was looking for retards with nothing to do. Shigeru Lord called Regigigas to help them prepare but Mario got scared so he killed him. The gang walk into another room as Shigeru Lord gave a Mighty Mushroom Morpher to each of them so it can give the user strength when needed.
The team made their way to Nintendo City and encountered Dr. Pootis but their attacks did nothing. Dr. Pootis blasted them with a Bullet Bill knocking them back. Peach suggests using the Mushroom Morphers which they do, becoming the Mario Rangers. The villain sends X-Nauts to attack but the team fights back and wins. Dr. Pootis flees to another part of the city but the gang follow him.
Dr. Pootis is seen singing and dancing, so Luigi suggests a surprise attack but everyone else left him. Mario jumped at him but Dr. Pootis grabbed Mario and threw him away. Toad brings a tank to attack, but Dr. Pootis blows it up. Dr. Pootis then kicks SMG4 and Peach. Ending his number, Dr. Pootis stomps on Luigi. Shigeru Lord calls Mario telling him he and the gang can summon mechs. Shigeru Lord was about to tell what they are or they'll summon random ones but Mario already ran off and told the others. Mario summons a bowl of spaghetti, Luigi summons a vacuum cleaner, Peach summons a frying pan, Toad summons the best chips in the world (Doritos) and SMG4 summons Hank Hill. The team go and beats Dr. Pootis but he summons a second mech so Mario suggests to combine the five mechs.
Nobody takes action so Mario tries to attach them together the best way. He is done 2 hours later and attacks Dr. Pootis. Dr. Pootis fires a energy ball but Mario jumps to avoid the attack. Suddenly, Mario's mech started falling apart so Mario charges at Dr. Pootis who fall out of his mech once again. Dr. Pootis reached for his remote to summon another mech but Mario stops him by throwing Luigi. The Mario Rangers returns to base with Dr. Pootis tied up and the Great Shigeru Lord thanked them. Luigi asked what he's going to do with Dr. Pootis and Shigeru Lord replies that he's going to sell him on Ebay. Shigeru Lords tell Mario and the gang that justice is always needed which reminds Mario that somewhere needs it. The scene cut to Mario back at McDonald's to demand for spaghetti before the blooper ends.