"EXTREME MAKEOVER: HOME EDITION" HELPS A PHYSICALLY CHALLENGED FAMILY WHOSE EXTRAORDINARY SPIRIT KNOWS NO LIMITS OTHER THAN THEIR SMALL AND UNSAFE HOME

Actor and Comedian Bill Engvall Volunteers for "Get on the Bus" Campaign; Surfer Bethany Hamilton Makes a Special Appearance

"Carr family" - "Extreme Makeover: Home Edition" travels to rural Mineola, TX, to meet Katrina and Mike Carr and their four adopted children from Kazakhstan (who were abandoned at birth), an inspiring family striving every day to overcome severe physical challenges while living in a cramped and dangerous home. This is a Texas-sized opportunity to give back to a family who have become role models of spirit and resilience. Comedian, actor, producer and author Bill Engvall is the "Get on the Bus" volunteer, while Bethany Hamilton, a surfer famous for losing her arm in a shark attack, spends time with the family on their vacation, on "Extreme Makeover: Home Edition," SUNDAY, MAY 2 (8:00-9:00 p.m., ET) on ABC.

Katrina and Mike Carr met while working at a summer camp for special-needs children. After they married six years later, the couple followed their passion of making a difference in the lives of others by adopting four kids from Kazakhstan who'd been abandoned at birth. Two of the children were born with Amniotic Band Syndrome, which caused Ryanne, now 7, to have both legs and one arm amputated, and Rina, 3, to lose a leg. Their brother Nikolas, 9, was recently diagnosed with Sensory Integration Dysfunction, which causes an inability to organize information as it comes through the senses. Compounding the family's struggles, health problems have required their father, Mike, 41, to have both pancreas and kidney transplants over the past decade. Yet, for all the challenges Ryanne, Rina, Nikolas and Mike face -- and which Katrina, 37, and daughter Haydn, 8, face with them - the Carrs carry on with unfailing spirit and optimism. Being a triple amputee hasn't stopped Ryanne, for example, from climbing trees, riding a handcycle and running. She's learned to rely on different prosthetics for different activities. Katrina, who has a master's degree in education, home-schools her children who otherwise would miss public school classes too often for doctors' appointments. Mike has taught environmental education at camps for special needs kids and is also an artist and jewelry designer.

The Carr family will go on vacation to Hilton Hawaiian Village in Honolulu while "Extreme Makeover: Home Edition" team leader Ty Pennington, designers Ed Sanders, Paige Hemmis, John Littlefield and celebrity volunteer Bill Engvall help to rebuild their home.

The series is produced by Endemol USA, a division of Endemol Holding. It is executive-produced by Anthony Dominici. David Goldberg is Chairman, Endemol North America. This program carries a TV-PG parental guideline.

For more information on "Extreme Makeover: Home Edition," visit ABC.com