The Mayo Monster is a monster made from mayonnaise that Entree made from the Spliced episode "Mo' Mayo, Mo' Problems". He was supposed to be the most delicious mayonnaise ever, but it turned out to be a monster putting everyone in a jar and Entree in what seems to be a small ketchup (or mayo) bag. At the end of Mo' Mayo, Mo' Problems, a female ketchup bottle called him Albert. He is voiced by Lawrence Bayne
- He can't fight his instincts with a B.L.T. sandwich.
- He hates it when people (such as Entree) land on their funny bone and get injured.
- He must be avenging all the condiments that have been squirted out of their "homes" by putting everyone in a jar.