Imperator Sael will appear as peons after Camelle appears.
Bringing cats that can take multiple hits/outrange Camelle are necessary here. Bringing Macho Legs cat might also help take down the Imperator Saels
One decent strategy is as follows:
Start off spawning 1-3 Crazed Whales, as they will do very well against the seals. The seals' deaths will give you the money for worker upgrades and Li'l Nyandam. Then rush with everything when you have enough, and the win shall be yours.
This stage becomes MUCH easier if you have the Chapter 3 alien treasures, since this stage was designed around having only 1 and 2 at this point.
4 star strategy
3 meatshields (Gato amigo, Li'l Eraser and Jiangshi were used here), Li'l Macho Legs, Paris Cat, Chill Cat, Zambony Cat (optional), A. Bahamut, Ururun, Li'l Nyandam. If you don't have Zambony, use an anti red cat.
Start by spawning ranged attackers to take care of the seals. They give you money to upgrade your worker. When you hit the base, spawn everything except A. Bahamut. Once the seals are taken care of, send out Bahamut to kill Camelle and kill the base.