The level will always randomly spawn a Squire Rel, a Trolly Blogger, or a Celeboodle. Celeboodle gets more powerful during the level, escalating to 900% strength magnification. Squire Rel, Celeboodle, and Trolly Blogger will continue to spawn. When the enemy's base starts taking damage, THE SLOTH will spawn, and is backed up by Teacher Bear. Be careful, as Teacher Bear is at 6000% strength magnification: 180k HP and 60k damage.
While the stage can be difficult, the best way to beat this stage in all stars is by stalling with double macho and double wall. Use C. Sexy Legs and double dragons to deal with the trolly bloggers and Celeboodles, while using Ururun and Bahamut to kill off teacher bear. To activate this, stall the enemies until you have max cash. Spawn main attackers, keep spawning dragons and legs BUT only spawn walls until you reach their base. Otherwise you could reach cat limit very quickly, causing you to lose extraordinarily fast. The Sloth will be killed with heavy stalling after the Celeboodles are killed.
This is one of those levels that is extremely easy if you have Super Galaxy Cosmo. Just stack Cosmo and let him slowly kill The Sloth, while at the same time, he kills the Trolly Bloggers and Celeboodle. Bahamut and Ururun are just helpers if you use this Gacha method.