Swingin' The Bat
Obviously, the Rovers have been able to conquer over the baddies they've faced (otherwise, they probably wouldn't have even LASTED the whole season). Here are details of the baddies they've met and conquered over. If I got any of this wrong, email me.  You can also check the details by clicking here. I also linked some sound files to them. For info on how to play these sounds, plus an important note concerning the sounds, click here. Otherwise go back to my main page.
Parvo and the Groomer
Profile: Appeared in:
All of the episodes except "Storm From The Pacific" to "Where Rovers Dare" and "Take Me To Your Leader"
Plans (besides ridding the Rovers, and most of them in order to rule the world):
1. "Let's Hit The Road": To get an experimental gene splicer called the Molecular Stabilizer to stabilize the Cano-mutator's effects
2. "Let Sleeping Dogs Lie": Going after some dinosaur eggs, and hatch them
3. "Hunter's Heroes": Capture some dogs, and change them into Cano-mutants. Some guy named Sergeant Curse was in this one too. Apparently, he wanted some of them.
4. "Dawn of the Groomer": Sacrifice Colleen and Blitz so that the Groomer could become immortal. (Only the Groomer was involved in this little plan... Parvo was so against doing it to cats.)
5. "Still a Few Bugs in the System": (With Prof. Eugene Atwater) Use giant mutated radiated bugs to create a nuclear winter. (That means "the chilling of climate that is hypothesized to be a consequence of nuclear war and to result from the prolonged blockage of sunlight by high-altitude dust clouds produced by nuclear explosions" - Merriam Webster Online)
Also he used his dog Greta to distract Muzzle from doing what he does best... doing general damage.
6. "Reigning Cats and Dogs": Travel back in time to get rid of Prof. Shepherd (this resulted in the events in the first scene of "Let's Hit the Road")
7. "Gold and Retrievers": Melt down treasures in an ancient pyramid he found to put the world economy out of whack (This succeeded... to a point.)
8. "A Day in the Life": Asked about the secrets of the Rovers, and when they refused, he hung them over a lava pit.
But the Rovers conquered over them (In the order of the list):
1. Hunter gave Cano-mutant a bomb when forced to exchange Stabilizer for Blitz.
2. After recovering the eggs, they put them back in to a cave, sprayed some mist making them sleep, and sealed it off. Also they turned the Cano-mutants they faced back to their original forms.
3. After freeing the dogs, Exile brought down the prison they were locked in.
4. The other Rovers literally brought down the house after freeing the pair.
5. After freezing down the bugs, the Rovers changed them back to their original forms. Also, if I recall correctly, Muzzle eventually dumped Greta, because Hunter said she'd been taken. (I'm sure about Muzzle dumping Greta, what I'm not sure is what Hunter said.)
6. The Rovers travelled back into time and Shag sent a letter warning him a la Back to the Future.
7. They got rid of the pyramid in a somewhat strange way. You can read the episode's summary here (at Krankor's site) or here (at Funyun's site).
8. After rescuing them, Muzzle proceeded to "muzzle" (i.e., attack) Parvo and Groomer.
Listen to this:
Groomer commenting on Parvo (Reigning Cats and Dogs)
Parvo just before he was bombed (Let's Hit the Road)
Parvo's three favorite words are "total world domination"... like that's a surprise! (Gold and Retreivers)
Groomer commanding some fish mutants (Gold and Retreivers)
Groomer giving Jeffrey Otitus a shave (Reigning Cats and Dogs)
Zachary Storm
Profile: He opened fire without orders in the Gulf War. As a result he was court martialed and given a dishonorable discharge (besides, he's also mad at the NFL for allowing the Cleveland Browns to move to Baltimore). He eventually ended up in a sanitarium -- the same one as Atwater (below).
Appeared in: "Storm From the Pacific" and "Take Me to Your Leader"
Plans:
1. Destroy US cities with a defense satellite which a decoder he stole is for, while ridding the Rovers by locking them up in a cell and sending lava towards it.
2. Rule the world or start a world war
Again, the Rovers conquered over them:
1. Muzzle rescued them (to their surprise, as Muzzle hadn't even been allowed on the trip), then they freed Muzzle from his restraints and set him on the baddies. The insane Rottweiler cleaned house and sent Storm and his goons fleeing. The Rovers, after thanking Muzzle for his assistance, re-restrained him and recovered the satellite decoder. And there was the matter of esaping the island after Storm set off a volcano eruption.
2. First they defeated him with the assistance of the Space Rovers, and as dogs, made sure their owners didn't suddenly start a war during a lunar eclipse.
Listen to these (all from Storm from the Pacific):
Storm comparing the Rovers to cats just after they left the cell and got the decoder back
Storm about his plan and why
Storm about what he is
Werewolves
Not much to say except that they changed others in to werewolves. When this included Colleen, the Rovers went for a cure from Confuseus. They appeared in "A Hair of the Dog that Bit You".
Listen to the "Werewolf Cure" song.
Gustav Havoc and Lieutenant Skeam
Profile: Gustav Havoc was a rebel arms dealer. Also Lieutenant Skeam's commander (the Lt. was the field commander).
Appeared in: "Where Rovers Dare"
Plans:  Lure Eisneria and Katzenstok into war, forcing them to buy arms from him, by stealing the Scepter of the Valley, the only remnant of their peaceful days. But when the Rovers took the scepter from him, he sent pursuers to recover it.
Still, the Rovers conquered over them: As soldiers began to search the town they hid in, some wolves came down from the mountains looking for food. One of the them was caught in the crossfire. Some of the Rovers, namely Colleen, Shag and Exile, operated on it. Later, when Gustav demanded that Hunter hand over the scepter, the point was settled when the hurt wolf awakened and began to howl. Wolves appeared and began to growl at Gustav. The UN (who'd sent the Rovers in the first place) then took him away. In short... the Rovers got frickin' lucky.
Listen to this: Skeam and Havoc talking to each other when the sceptre got taken
Donovan Bell
Profile: He was a dognapper, as in someone who steals dogs from their rightful owners.
Appeared in: "The Dog Who Knew Too Much"
Plans: Prevent "Sport", one of the dogs he had kidnapped, from testifying him on charges of the disappearance of Olivia Peru, his rightful owner.
Eventually, the Rovers conquered over them: They ended up taking Sport through a very long chase, which also had Parvo chasing them too, before they finally got him to court, and then returned the dog to Peru.
Prof. Eugene Atwater
Profile: Believed that with war, toxic waste and nuclear war ravaging the earth the only way humans will be able to survive is to become bugs. Was ridiculed when he asked for funding for his research. With Groomer's help, later exposed his bugs to vast amounts of radiation which surprisingly made them strong and resilient. Eventually ended up in a sanitarium.
Appeared in: "Still a Few Bugs in the System"
For the info that goes in "Plans" and "The Rovers conquered over them": See Parvo and Groomer (No. 5)