Slab is a one-shot character from the TV show Quack Pack. He appears in the episode "Can't Take a Yolk".
Role in the episode
Slab first shows up when he sees Huey, Dewey and Louie talking to Alexandra and Cassandra Mergancer. He grabs the nephews, claiming that the girls are his and are just unaware of it. Just as he's about to give the nephews the boot, Donald walks in, looking like he did in the early days.