|Appearances||Operation: C.L.U.E.S. (as a normal Rainbow Monkey)|
The Spankenstine Monster used to be Numbuh 3's currently-deceased Posh Party Rainbow Monkey after Mushi Sanban forked it in the back during a dinner party at Numbuh 2's house in Operation: C.L.U.E.S., but was reborn as a Spankenstine Beast. After Numbuh 2 had caught Mushi in the act of forking the Rainbow Monkey doll, giving Mushi a grounding sentence with no hope for TV, the doll was buried at Plush Meadows Stuffed Animal Cemetery.
Later, Mushi dug up the doll from its burial site and-- thanks to her Pizatronic Defibrillinationer Power Switcher-- brought back to life as a Spankenstine Monster using Count Spankulot's powers, right before Count Spankulot could get the chance to spank her for forking the doll. Shortly after the doll was brought back to life, Mushi sent it after Numbuh 2 as revenge for the previous incident. The Spankenstine Monster is stronger than Count Spankulot. He has a drawer lower jaw, two beds for feet, gloved hands, a white tux and a top hat.
While getting chocolate sauce at the local grocery store owned by Joe Balooka's dad during a dinner party at the Sanban Residence, Joe accused Numbuh 2 of stealing the chocolate sauce, but Numbuh 2 claimed he paid for it by leaving money on the counter. Stewie, Joe's assistant, was sent inside the store to check, only to come face-to-face with the beast. After the beast spanked Stewie, he went to finish Numbuh 2 off, chasing him to the power plant next door to the store. He was turned good again from a hug by Numbuh 2. Then, Joe shot a water balloon at the monster, getting it caught in the wires, and destroying it and blowing up the power plant, changing it back to normal so it can be reburied. Spankulot had to suck out the stolen powers in the Rainbow Monkey doll to gain his powers back.
- He is the same size as Rainbow Monkey Kong.
- He is a parody of Frankenstein's Monster.