5-1 Presto the Tadpole: Presto is a tadpole that can become any other pet you want. However, he recharges in Adventure Mode.
Pets during the battle
All pets appear, except Angie the Angelfish, Brinkley, Nostradamus, Walter, and Stanley (regardless if the player purchases them or not).
Effects of Pets
- Stinky will hide into his shell every time Cyrax has summoned an alien.
- Itchy will get angry if Cyrax has summoned an alien. However, Itchy is unable to attack, because these enemies are able to eat him. If Cyrax or one of the aliens is destroyed, Itchy will change his mood.
- Gumbo's light will activate, but she will not move away from aliens or attract any fish.
Other pets will have no effect.
Cyrax - The evil mastermind of the aliens. Cyrax can't damage any of your pets by himself, but he is able to summon all the aliens that you have seem before and mini Sylvesters, smaller and weaker versions of Sylvester. He is the alien that is more resistant, surviving for a huge quantity of laser shots. He can be very easy if he summons Destructor first, because if he summons Destructor first, all you have to do is destroy his missiles, the mini-Sylvesters and (obviously) Cyrax. If you don't get Destructor first exit the level, then go back into it. Keep doing that until he summons Destructor first.
Mini-Sylvester - A much smaller version of Sylvester. He can be summoned at any time, even when another Alien is present in Tank. To kill it, you need only one shoot, but because of it size and speed, he is able to eat all of your pets if not spotted quickly.
Summoned by Cyrax
- Sylvester and Balrog are summoned together.
- Gus has a different manner unlike in Tank 2 to Tank 4. Instead of being immune to lasers, the alien can be damaged with lasers. When he goes into contact into a pet, Gus will explode.
- Destructor is the most recommended alien you must keep him alive to free all your pets. Destroy his missiles, but don't shoot him yet.
- Psychosquid will not gain his health whenever you shoot him when he turns blue. Psychosquid is a normal enemy.
- Ulysses is one of the most dangerous aliens in the tank. These energy balls will kill all pets in one hit if redirected in wrong direction and can also damage Cyrax when hit.
- Bliaterus is also one of the dangerous aliens in the tank. He and Ulysses will destroy many pets. Keep him on the right side of the tank so his bones won't eat the pet and destroy the two heads.
- When the aliens, including Mini-Sylvester, kills all the pets, the "Game Over: Oops! All of your pets (instead of fish) died" dialog box will appear.