From the TV Guide listing:
MonsterQuest : Super Rats Airs on Saturday July 05 09:00 PM
Recent archaeological evidence suggests that common rats once grew to massive sizes. Are these huge rodents making a comeback? Claims of huge rat sightings are being reported in startling numbers. Animal experts believe that these mutant rodents are getting bigger and bolder. Journey into the sewers with rat experts and meet witnesses who tell of cat-sized rats that have appetites for just about anything--including human flesh!
SUPER RATS is the most skin-crawling MONSTERQUEST yet!
I was originally hired to be a locations guide for them but I ended up being filmed and they used a bit of it-- their original plan of attaching cameras to rats to get the rodent-eye view (seriously!) didn't work out so well, and so I got a bigger part.
You can actually order this episode from them: http://store.aetv.com/html/product/index.jhtml?id=138750&name=Super+Rats+DVD